Fail early and give tailored message when dot command is not present.

[vanniktech]

No description provided.

[codecov]

Codecov Report

Merging #2 into master will increase coverage by 2.33%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master       #2      +/-   ##
============================================
+ Coverage     83.85%   86.19%   +2.33%     
- Complexity       41       48       +7     
============================================
  Files            12       12              
  Lines           254      268      +14     
  Branches         28       32       +4     
============================================
+ Hits            213      231      +18     
+ Misses           39       31       -8     
- Partials          2        6       +4

Impacted Files	Coverage Δ	Complexity Δ
...cy/graph/generator/DependencyGraphGeneratorTask.kt	3.22% <0%> (+3.22%)	5 <0> (+5)	⬆️
...aph/generator/DependencyGraphGeneratorExtension.kt	100% <0%> (+6.25%)	1% <0%> (ø)	⬇️
.../graph/generator/DependencyGraphGeneratorPlugin.kt	100% <0%> (+100%)	2% <0%> (+2%)	⬆️

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