Fix glob expansion preceeded with variable

The pattern $var/* is split into a variable and a glob part, but after expansion the variable wasn't concatenated with the original glob pattern. This resulted in /* being expanded instead of value/* pattern. This is fixed by concatenating the last word in the expanded string with the glob pattern except if there's a separating whitespace character between them (i.e.: value\t/*).

Fixes #836 (closed)