Catch the import error of hnswlib

[Sichao25]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (1e8ffe4) 22.54% compared to head (6962974) 22.16%.
Report is 166 commits behind head on master.

Files	Patch %	Lines
dynamo/tools/connectivity.py	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #632      +/-   ##
==========================================
- Coverage   22.54%   22.16%   -0.38%     
==========================================
  Files         166      166              
  Lines       27362    28035     +673     
==========================================
+ Hits         6168     6215      +47     
- Misses      21194    21820     +626     

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