#905 lxpanel: monitor may crash when copy/pasting color from somewhere else

[Mamoru TASAKA]

Downstream bug: https://bugzilla.redhat.com/show_bug.cgi?id=1544406

Monitor plugin may crash when copy/paste-ing color from somewhere else.
One easiest may to reproduce this is:

• Add "resource monitor" to lxpanel
• on resource monitor plugin, click right button, and choose "resource monitor setting"
• on "CPU color", remove (clear) color string
• then click "RAM color" string window

[Mamoru TASAKA]

gdb log

[Mamoru TASAKA]

I think the attached patch should fix this issue. Would you review this?

[Lonely Stranger]

Looks fine, I've pushed your change into GIT. Thank you very much!