LstsqDrop can solve for all-zero weights #1607
                
     Merged
            
            
          
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Motivation and context:
Fixes #1541, where all-zero weights caused
info1to not be defined.info1has been replaced byinfo1s, a list of theinfodictsreturned by the second solver.
Also made the wording changes (
post_synapse->pre_synapse) as per #1560.How has this been tested?
Added a test based on the original issue.
How long should this take to review?
Where should a reviewer start?
Types of changes:
Checklist: