Fails on missing git executable

[cmahnke]

It should be possible to ignore a missing executable, like git, by setting failTheBuild to false.

29.34 [ERROR] Failed to execute goal org.codehaus.mojo:buildnumber-maven-plugin:3.2.0:create (default) on project planetiler-parent: Cannot get the revision information from the scm repository : 
29.34 [ERROR] Exception while executing SCM command.: Error while executing command. Error while executing process. Cannot run program "git" (in directory "/tmp/build/planetiler"): error=2, No such file or directory

Note that even setting

        <configuration>
          <doCheck>false</doCheck>
          <doUpdate>false</doUpdate>
          <failTheBuild>false</failTheBuild>
        </configuration>

The behaviour should be changed in a way that setting <failTheBuild>false</failTheBuild> should only emit a warning if the executable is missing (or any other state the would be considered an error) an not breaks the build. Otherwise the option should be remove since it's misleading if this is considered to be working as expected.