Dragging a collapsed function call block causes a crash if the function has inputs

[nederland074]

Describe the bug

Collapsed function call blocks cannot be dragged because of crashes. This is reproduced if the corresponding function definition block has at least one input. It works as expected if a function has no inputs, though.

To Reproduce

Steps to reproduce the behavior:

1. Drag out a function definition block.
2. Add an input to the block.
3. Drag out the corresponding function call block.
4. Collapse the function call block via Right Click -> "collapse block".
5. Drag the function call block.

Expected behavior

Dragging should work without crashes.

Stack Traces

Uncaught TypeError: Cannot read property 'fieldRow' of undefined
    at Blockly.InsertionMarkerManager.createMarkerBlock_ (blockly_compressed.js:146)
    at new Blockly.InsertionMarkerManager (blockly_compressed.js:141)
    at new Blockly.BlockDragger (blockly_compressed.js:161)
    at Blockly.TouchGesture.Blockly.Gesture.startDraggingBlock_ (blockly_compressed.js:303)
    at Blockly.TouchGesture.Blockly.Gesture.updateIsDraggingBlock_ (blockly_compressed.js:300)
    at Blockly.TouchGesture.Blockly.Gesture.updateIsDragging_ (blockly_compressed.js:302)
    at Blockly.TouchGesture.Blockly.Gesture.updateFromEvent_ (blockly_compressed.js:297)
    at Blockly.TouchGesture.Blockly.Gesture.handleMove (blockly_compressed.js:308)
    at Blockly.TouchGesture.handleMove (blockly_compressed.js:590)
    at HTMLDocument.h (blockly_compressed.js:782)

Additional context

This issue looks similar to #2363. I tried a workaround suggested here: #2363 (comment) and it seems to work fine.

[nederland074]

also here's a link to a test case: https://blockly-demo.appspot.com/static/demos/code/index.html#86em5q
if you try to drag the collapsed block you can see crashes in the console

[alschmiedt]

Thanks for reporting @nederland074! Should be fixed in #3591.