stack import fails

[k-dominik]

Describe the bug

using two uint16 tif (one with 1 channel, one with 2 channels) images and trying to stack them results in an error

my guess is that the first one does not have a channel axis, but that's to be verified.

Expected behavior

this should work of course.

To Reproduce

Steps to reproduce the behavior:
In data selection, go to via the stack import

1. Select files, select one single channel, one multi-channel file and stack across c

Error message/traceback

If applicable, please add tracebacks with formatting, such as

ERROR 2021-03-23 12:12:02,765 excepthooks 30642 140194647336768 Unhandled exception in thread: 'MainThread'
ERROR 2021-03-23 12:12:02,776 excepthooks 30642 140194647336768 Traceback (most recent call last):
  File ".../ilastik-meta/ilastik/ilastik/applets/dataSelection/dataSelectionGui.py", line 611, in addStack
    stack_info = self.instantiate_dataset_info(url=url, role=roleIndex, sequence_axis=stackDlg.sequence_axis)
  File ".../ilastik-meta/ilastik/ilastik/applets/dataSelection/dataSelectionGui.py", line 574, in instantiate_dataset_info
    info = self.parentApplet.create_dataset_info(url=url, *info_args, **info_kwargs)
  File ".../ilastik-meta/ilastik/ilastik/applets/dataSelection/dataSelectionApplet.py", line 253, in create_dataset_info
    filePath=url, axistags=axistags, sequence_axis=sequence_axis
  File ".../ilastik-meta/ilastik/ilastik/applets/dataSelection/opDataSelection.py", line 653, in create_or_fallback_to_absolute
    return cls(*args, **kwargs)
  File ".../ilastik-meta/ilastik/ilastik/applets/dataSelection/opDataSelection.py", line 646, in __init__
    super().__init__(**fs_info_kwargs)
  File ".../ilastik-meta/ilastik/ilastik/applets/dataSelection/opDataSelection.py", line 547, in __init__
    graph=Graph(), WorkingDirectory=self.base_dir, FilePath=self.filePath, SequenceAxis=self.sequence_axis
  File ".../ilastik-meta/ilastik/lazyflow/operator.py", line 141, in __call__
    instance._after_init()
  File ".../ilastik-meta/ilastik/lazyflow/operator.py", line 304, in _after_init
    self._setupOutputs()
  File ".../ilastik-meta/ilastik/lazyflow/operator.py", line 498, in _setupOutputs
    self.setupOutputs()
  File ".../ilastik-meta/ilastik/lazyflow/operators/ioOperators/opInputDataReader.py", line 214, in setupOutputs
    self.internalOperators, self.internalOutput = openFunc(filePath)
  File ".../ilastik-meta/ilastik/lazyflow/operators/ioOperators/opInputDataReader.py", line 349, in _attemptOpenAsTiffStack
    opReader.GlobString.setValue(filePath)
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 73, in call_in_setup_context
    return func(self, *args, **kwargs)
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1143, in setValue
    self._changed()
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1328, in _changed
    self.maybe_call_within_transaction(self._changed_impl)
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1323, in maybe_call_within_transaction
    self.graph.maybe_call_within_transaction(fn)
  File ".../ilastik-meta/ilastik/lazyflow/graph.py", line 143, in maybe_call_within_transaction
    fn()
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1361, in _changed_impl
    self._configureOperator(self)
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1374, in _configureOperator
    self.maybe_call_within_transaction(self.operator._setupOutputs)
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1323, in maybe_call_within_transaction
    self.graph.maybe_call_within_transaction(fn)
  File ".../ilastik-meta/ilastik/lazyflow/graph.py", line 143, in maybe_call_within_transaction
    fn()
  File ".../ilastik-meta/ilastik/lazyflow/operator.py", line 498, in _setupOutputs
    self.setupOutputs()
  File ".../ilastik-meta/ilastik/lazyflow/operators/ioOperators/opTiffSequenceReader.py", line 122, in setupOutputs
    stacker_slot.connect(opReader.Output)
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 73, in call_in_setup_context
    return func(self, *args, **kwargs)
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 543, in connect
    self._changed()
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1328, in _changed
    self.maybe_call_within_transaction(self._changed_impl)
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1323, in maybe_call_within_transaction
    self.graph.maybe_call_within_transaction(fn)
  File ".../ilastik-meta/ilastik/lazyflow/graph.py", line 143, in maybe_call_within_transaction
    fn()
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1361, in _changed_impl
    self._configureOperator(self)
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1374, in _configureOperator
    self.maybe_call_within_transaction(self.operator._setupOutputs)
  File ".../ilastik-meta/ilastik/lazyflow/slot.py", line 1323, in maybe_call_within_transaction
    self.graph.maybe_call_within_transaction(fn)
  File ".../ilastik-meta/ilastik/lazyflow/graph.py", line 143, in maybe_call_within_transaction
    fn()
  File ".../ilastik-meta/ilastik/lazyflow/operator.py", line 498, in _setupOutputs
    self.setupOutputs()
  File ".../ilastik-meta/ilastik/lazyflow/operators/generic.py", line 196, in setupOutputs
    self.setRightShape()
  File ".../ilastik-meta/ilastik/lazyflow/operators/generic.py", line 231, in setRightShape
    newshape[axisindex] = c
IndexError: list assignment index out of range

Desktop (please complete the following information):

• ilastik version: 1.3.3post3, 1.4.0x

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/export-and-import-of-predictions/50514/2