This is one of several bugs relating to windows missing from the launcher (and Alt-Tab switcher). I hope they all turn out to be the same bug.
See also: Bug 995916: No launcher icon or Alt+Tab entry for Gimp windows Bug 999171: No launcher icon or Alt+Tab entry for Scribus windows Bug 762193: No launcher icon or Alt+Tab entry for xchat/xchat-gnome windows Bug 951929: Unity launcher and Alt-Tab switcher missing entry for gnome-terminal
This is one of several bugs relating to windows missing from the launcher (and Alt-Tab switcher). I hope they all turn out to be the same bug.
See also:
Bug 995916: No launcher icon or Alt+Tab entry for Gimp windows
Bug 999171: No launcher icon or Alt+Tab entry for Scribus windows
Bug 762193: No launcher icon or Alt+Tab entry for xchat/xchat-gnome windows
Bug 951929: Unity launcher and Alt-Tab switcher missing entry for gnome-terminal