#217 Fails to execute program when path contains empty entry

[h3xx]

When the environment variable $PATH contains an empty entry, trying to open a file using a program after the empty entry fails to do execute (no error message, no indication).

Version where bug was observed:

• xfe 1.41
• fox 1.6.50 stable
• Slackware Linux 14.2 x86_64 kernel 4.1.13

Steps to reproduce:

1. Run xfe with a PATH with a double-colon in it:

   $ PATH=~/bin::/usr/bin:/bin xfe

2. Attempt to open any file where the associated program is outside of ~/bin

Result: Associated program does not execute. Program names typed into the "Open With" dialog do no execute.

[Roland Baudin]

This is fixed in Xfe 1.42.