Don't add component_name if we didn't found one.

[bmillemathias]

If the expected list of components found is empty, do nothing.
I nonetheless modified also the template so when no component is found
we write it explicitely instead of return 'None'

Fixes #1301

[codecov]

Codecov Report

Merging #1408 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1408      +/-   ##
==========================================
+ Coverage   56.48%   56.49%   +0.01%     
==========================================
  Files          56       56              
  Lines        9143     9143              
==========================================
+ Hits         5164     5165       +1     
+ Misses       3979     3978       -1     

[lgtm-com]

This pull request introduces 1 alert and fixes 3 when merging 0850ba3 into 0fd3f4e - view on LGTM.com

new alerts:

• 1 for Syntax error

fixed alerts:

• 2 for Except block handles 'BaseException'
• 1 for Suspicious unused loop iteration variable

[mkrizek]

Shouldn't we still post the comment suggesting to use the component command when the bot is not able to figure out the component?

I think it makes sense to omit the comment only if the whole component section is missing from the template.

[mkrizek]

@bmillemathias are you still interested on working on this PR?

[mkrizek]

Closing due to inactivity.