Fix print legend visibility issues

[theduckylittle]

1. Adds check to ensure min/maxresolution are in range when
   specified.
2. Adds a check to ensure the legend has not been turned off in the
   catalog.

refs: #706

[chughes-lincoln]

This makes my print legends look so much better already!

A couple of notes:

1. It correctly honors legends being set to false in the catalog
2. It doesn't seem to honor scale based legends in the catalog or the print out (not a new issue in the catalog, I believe that's how it already was)

An example for 2: I have a contours dataset with 40ft and 10ft contours grouped into the same map-source. At the full extent and scale of my map neither of them show up in the map, but they do show up as white space in the catalog legend and the print legend. If I zoom in a bit the 40ft contours appear, including the legend. At this scale there's some white space in the catalog and print legends due to the 10ft contours. If I zoom in further the 10ft contours replace the 40ft contours, and I now see some white space in the catalog and print legends due to the 40ft contours.