Due to missed splitlines() in test_pydoc the HTML output was not tested correctly. Instead of testing that the actual output contains every *line* from the expected output it tested that the actual output contains every *character* from the expected output. The test would pass with any actual output which contains all Latin letters and some punctuation.

The following PR fixes this bug and makes the test even more strict. Now it tests that the actual output contains the same lines as the expected output, in the same order, ignoring indentation and empty lines.