Show ModuleFileParser allows empty conditionalResource elements
the ModuleFileParser currently allows
<conditionalResource>
</conditionalResource>
which leads to a ModuleConditionalResource which has no path and no
version. This also shows that the ModuleConditionalResource is flawed
since it only has a default constructor which leads to a state that
should not be allowed
TRUNK-5385 Harmonize method parameter order
put Element first in extractModulesWithVersionAttribute as all other
methods which take more than one parameter with on of them of type Element
have it first
TRUNK-5385 Harmonize extractConditionalResource tests
move tests for extractConditionalResource into ModuleFileParserTest to
use same style of tests against the public methods instead of package
private one to prepare making it private
after refactorings where dependencies of ModuleFileParser will be put
into its constructor ModuleFileParser(MessageSourceService), the tests
can be written as BaseContextMockTests without use of a database
