mouse over crosslinks histogram of closed structure causes traceback

[Elaine Meng]

More along the lines of idiot-proofing. Need to close histogram when structure closes, or maybe explicitly disconnect it somehow?

open 5ml1 format pdb coord t
crossl histogram #1
close #1
(mouse over histogram)

/Users/chimera/Applications/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/chimerax/core/atomic/molarray.py:234: VisibleDeprecationWarning: boolean index did not match indexed array along dimension 0; dimension is 0 but corresponding boolean dimension is 36
return self._objects_class(self._pointers[mask_or_indices])
Traceback (most recent call last):
File "/Users/chimera/Applications/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/chimerax/crosslinks/lengths.py", line 65, in _mouse_move
self._pick_bin(i)
File "/Users/chimera/Applications/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/chimerax/crosslinks/lengths.py", line 85, in _pick_bin
bpb = pb.filter(self._pbond_bin_index == b)
File "/Users/chimera/Applications/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/chimerax/core/atomic/molarray.py", line 234, in filter
return self._objects_class(self._pointers[mask_or_indices])
IndexError: index 1 is out of bounds for axis 1 with size 0

[Tom Goddard]

Fixed.