add features to paramtest

[dcarver1]

Currently the paramtest function does not account for species with occurrence data but no SDM. I thought there would error with that case before users got into the function. However, folks are getting that far.

I added the solution, which is very simple to paramTest.R on the test02 branch. The troublesome element will be we need to add an addational check to all functions that use the paramtest. I'd like to figure out how this is happening before putting that work in.

The error user are seeing is something that does not indicate a missing SDM, so it's not very informative.