javasphinx-apidoc throws an error when a file contains only commented code

[rbjorklin]

javasphinx-apidoc throws an error when a file contains only commented code.

javasphinx-apidoc -o javasphinx ~/svn/trunk/
ERROR:root:Unexpected exception while compiling <path to file with only commented code>
Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/javasphinx/apidoc.py", line 190, in generate_from_source_file
    documents = doc_compiler.compile(ast)
  File "/usr/lib/python3.5/site-packages/javasphinx/compiler.py", line 323, in compile
    raise ValueError('File must have package declaration')
ValueError: File must have package declaration