[FIX] Avoid some context crashes: exclude_attributes=True #707
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Some contexts match even though feature-selection combo boxes do not show the feature. Problematic settings are those where combo boxes are limited to specific parts of the table (attributes, class_vars, or metas).
This partial solution follows from biolab/orange3#6721 (comment). This does not solve the problem completely, but if problem appears, adding a new widget instance allows the user to continue.
Also, there is another minor issue: exclude_attributes won't allow users to reuse contexts where class vars were used in the fields (current implementation handles attributes and class vars in the same way), but saving and loading works properly (because of perfect matches).