Handle execution timeout on CLI

[gonzalezzfelipe]

Handles error caused by #347.

[codecov-commenter]

Codecov Report

Merging #348 (aaf2c4f) into master (5713ac7) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #348   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines         2232      2233    +1     
=========================================
+ Hits          2232      2233    +1     

Impacted Files	Coverage Δ
gql/cli.py	100.00% <100.00%> (ø)

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[leszekhanusz]

Closed in favor of #349