Throw exception when missing username or password only when executing the task.

[vanniktech]

No description provided.

[codecov]

Codecov Report

Merging #2 into master will increase coverage by 0.11%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master       #2      +/-   ##
============================================
+ Coverage     90.36%   90.47%   +0.11%     
  Complexity        4        4              
============================================
  Files             2        2              
  Lines            83       84       +1     
  Branches          6        6              
============================================
+ Hits             75       76       +1     
- Misses            3        5       +2     
+ Partials          5        3       -2

Impacted Files	Coverage Δ	Complexity Δ
...vanniktech/maven/publish/MavenPublishPlugin.groovy	92.4% <33.33%> (+0.09%)	1 <0> (ø)	⬇️

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