Executable missing path seperator

Problem/Motivation

We setting the configuration for ImageMagick in the admin, the details about the capabilities are not displayed. Rather an error message stating "The ImageMagick executable /usr/binconvert does not exist.". The path seperator is not being added if it is missing.

Proposed resolution

Check for the directory separator and if it is not present, add it. I'll have a patch for this shortly.