HRGT (a) produces text where it should not, and (b) uses wrong logging syntax

[RieksJ]

Here is a part of the log when generating the tev2-specifications stuff:

While it is correct that the concept 'action' should not result in a converted text, the log should write ... 'concept:action' ... rather than ... 'action:concept' ....

The stuff that is actually generated is this:

As you can see, rather than NOT generating texts, the name of the converter is used as the text (which is wrong).

So:

• [x] the log should mention <termType>:<term> (instead of the other way around), and
• [x] when a converter does not produce any text, it's good to log that, but it should NOT produce a text as its regular output.

[Ca5e]

I've changed the behaviour slightly. Now, when no expression is filled, the replacement text is not added. The replacement text is correct in the sense that markdown-abbr-table-row doesn't yet exist as a default in the latest published version, and is thus assumed to be the template. Will publish the new version tomorrow.