Error in unwrap_fringe.py

[vbrancat]

unwrap_fringe.py fails when using SNAPHU unwrapper. The code fails because of non-existent metadata/XML file. Below an error report:

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length, width:  1217   7620
Traceback (most recent call last):
  File "/home/vbrancat/Fringe/install/bin/unwrap_fringe.py", line 182, in <module>
    unwrap_snaphu(inps, length, width, metadata)
NameError: name 'metadata' is not defined

The issue popped up when I updated my main branch. At glance, the issue seems to be related to abug related to the merge of PR #45. Particularly, the bug is at line

fringe/python/unwrap_fringe.py

Line 105 in 67483e9

def unwrap_snaphu(inps, length, width, metadata):

where I think metadata should be set to None by default

@hfattahi @bjmarfito