throw exception if value is null
throw exception if node for subprojection is null
added unit test for throwThrowable
add args to constructor within throwThrowable
added test using args as exception arguments
Applying exception throw feature to all return types of reading
projection methods.
Merge branch 'master' into ExeptionOnNonexistingValues
Merge pull request #21 from SvenEwald/ExeptionOnNonexistingValues

Exeption on nonexisting values