Comment 1 for bug 1288906

While trying to come up with a minimal test case, I realized that I was wrong. The problem wasn't presence or absence of a pin on the symbol, the problem was that if there's no refdes assigned the symbol is silently ignored. It seems that it would be useful to throw a warning if a symbol is found with no refdes, but I'm not inclined to push that rope.

I also discovered in the process that the scheme for gnetlist -g drc breaks if there are no nets in the schematic. I found this by adding 3 symbols to a schematic page and trying to run drc on the page without connecting anything up. This is probably worth fixing, but isn't really related to my original complaint.