Allow creating Layout from views without Pipeline

[philippjfr]

As stated in the title.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 55.77%. Comparing base (bd4d92e) to head (1b71ad7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lumen/layout.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #725   +/-   ##
=======================================
  Coverage   55.77%   55.77%           
=======================================
  Files          98       98           
  Lines       11893    11896    +3     
=======================================
+ Hits         6633     6635    +2     
- Misses       5260     5261    +1     

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