Catch all errors, not just NERDTree errors. #894
Merged
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Fixes #893
When middle-clicking, the s:TreeFileNode.GetSelected() function is
called along the way. If this is done outside of the NERDTree window,
there is no "b:NERDTree" variable, and the "E121: Undefined variable"
exception is thrown. This function was trying to catch only the NERDTree
specific errors; thus, it let the Undefined variable exception slip by.
This commit forces the function to catch all errors.