Fix error 500 in running 'meta attribute <prj>'

[dmach]

No description provided.

[pep8speaks]

Hello @dmach! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file osc/commandline.py:

Line 4449:121: E501 line too long (131 > 120 characters)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cff6a0c) 31.51% compared to head (dcef7fa) 31.51%.
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1491   +/-   ##
=======================================
  Coverage   31.51%   31.51%           
=======================================
  Files          51       51           
  Lines       17938    17938           
=======================================
  Hits         5653     5653           
  Misses      12285    12285           

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