Incorrect d2d "unmapped to" mappings reported

[pombredanne]

The example of Java d2d in #1112 (comment) may not return correct results

We have 780 unmapped to, but all them have also a status, but we should NOT only use the empty status. The status does not matter for the unmapped.

Otherwise we get this empty output:

[pombredanne]

We should also only list files and symlinks, and not directories

[pombredanne]

This should also be part of the d2d results returned in MatchCode.io