piano: Don't decrypt too short urls
piano: Don't decrypt too short urls

Avoids invalid memory reads/writes

DavidZemon/pianobar,johndeeney/pianobar,twahlfeld/pianobar,DavidZemon/pianobar,gnowxilef/pianobar,johndeeney/pianobar,twahlfeld/pianobar,twahlfeld/pianobar,johndeeney/pianobar,tchajed/pianobar,gnowxilef/pianobar,johnso51/pianobar,Vi1i/pianobarfly,twahlfeld/pianobar,johndeeney/pianobar,twahlfeld/pianobar,bmbove/pianobar-save,gnowxilef/pianobar,gnowxilef/pianobar,bmbove/pianobar-save,DavidZemon/pianobar,Vi1i/pianobarfly,tchajed/pianobar,gnowxilef/pianobar,johndeeney/pianobar,DavidZemon/pianobar,bmbove/pianobar-save,johnso51/pianobar,johnso51/pianobar,tchajed/pianobar,twahlfeld/pianobar,johndeeney/pianobar,tchajed/pianobar,bmbove/pianobar-save,DavidZemon/pianobar,Vi1i/pianobarfly,johnso51/pianobar,bmbove/pianobar-save,tchajed/pianobar,johnso51/pianobar,Vi1i/pianobarfly,DavidZemon/pianobar,Vi1i/pianobarfly,tchajed/pianobar,gnowxilef/pianobar,johnso51/pianobar