[Tests-Only] Adjust PHPdoc for phpstan

[phil-davis]

Description

The latest phpstan 0.12.30 recognises that the PHPdoc for $application claims that it is always set. So last night it complained: https://drone.owncloud.com/owncloud/data_exporter/1190/2/5

php -d zend.enable_gc=0 vendor-bin/phpstan/vendor/bin/phpstan analyse --memory-limit=4G --configuration=./phpstan.neon --no-progress --level=5 appinfo lib
 ------ --------------------------------------------------------------------- 
  Line   appinfo/register_command.php                                         
 ------ --------------------------------------------------------------------- 
  10     Variable $application in isset() always exists and is not nullable.  
 ------ --------------------------------------------------------------------- 

 [ERROR] Found 1 error

Adjust the PHPdoc so it admits that the var could be null. That stops phpstan from complaining about the "unnecessary" isset() check.

How Has This Been Tested?

CI

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #166 into master will not change coverage. The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master     #166   +/-   ##
=========================================
  Coverage     85.67%   85.67%           
  Complexity      235      235           
=========================================
  Files            36       36           
  Lines          1117     1117           
=========================================
  Hits            957      957           
  Misses          160      160           

Impacted Files	Coverage Δ	Complexity Δ
appinfo/register_command.php	0.00% <0.00%> (ø)	0.00 <0.00> (ø)

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