#204 Backbone Assignment module stops working after some exception

[wb104]

Using Sec5Part2, connect @55 and @100 and then assign them to A57 and S58 by dragging to the Sequence Module. If you then drag @72 onto A57 on the display, you hit:

Traceback (most recent call last):
File "/Users/wb104/githome/analysis/src/python/ccpn/ui/gui/widgets/DropBase.py", line 89, in dropEvent
self._dropEventCallback(dataDict)
File "/Users/wb104/githome/analysis/src/python/ccpn/ui/gui/lib/GuiNotifier.py", line 198, in call
self._callback(callbackDict, self._args, *self._kwargs)
File "/Users/wb104/githome/analysis/src/python/ccpn/AnalysisAssign/modules/BackboneAssignmentModule.py", line 274, in _processDroppedNmrResidue
nmrResidue.connectPrevious(droppedNmrResidue)
File "/Users/wb104/githome/analysis/src/python/ccpn/core/NmrResidue.py", line 490, in connectPrevious
raise ValueError("Cannot connect assigned NmrResidue - assign the value instead")
ValueError: Cannot connect assigned NmrResidue - assign the value instead

Likely this counts as a feature (!).

But with the above exception, the Backbone Assignment module stopped working, so you could select an NmrChain in the pulldown list but the table no longer updated.

[wb104]

Problem was in function _processDroppedNmrResidue(). In there we have

self.nmrResidueTable.setUpdateSilence(True)

And the turning off of this needs to be in a try/finally block in case there is an exception thrown in the code (which is what happened in this case). Otherwise the table is never updated.