fix: getModules() won't return a non-existing module
* [fix] NPEs in NewServiceWizard, when there are no modules available (possible because of previous commit)
* [refacor] improve error checking and introduce @Messages for error messages
issue #27: Support autodiscovery of modules in maven-projects
Merge pull request #28 from markiewb/bugfix/issue25_modulesnotfound

Fixing module detection and autodiscovery of modules in maven project