Fixes a potential bug on pip install

[ethanwharris]

What does this PR do?

Fixes a bug which could occur if the line from pytorch_lightning import __about__ triggers something other than an ImportError. Was observed in flash, see here: Lightning-Universe/lightning-flash#247

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[codecov]

Codecov Report

Merging #7256 (3a3a9fa) into master (0c6c078) will increase coverage by 0%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #7256    +/-   ##
=======================================
  Coverage      91%     92%            
=======================================
  Files         199     199            
  Lines       12786   13252   +466     
=======================================
+ Hits        11665   12145   +480     
+ Misses       1121    1107    -14     

[Borda]

lets fix it also in docs/config

[ethanwharris]

@Borda Done 😃