Test whether any image reps can init with a given data object before accepting it.
Test whether any image reps can init with a given data object before accepting it.

Fixes a crash I had with a ticket containing an empty application-icon data object.

doshinirav/doshinirav-myversion,CarlosCD/growl,coltonfisher/coltonfisher-growl,coltonfisher/coltonfisher-growl,CarlosCD/growl,doshinirav/doshinirav-myversion,doshinirav/doshinirav-myversion,coltonfisher/coltonfisher-growl,CarlosCD/growl,CarlosCD/growl,CarlosCD/growl,CarlosCD/growl,CarlosCD/growl,doshinirav/doshinirav-myversion,doshinirav/doshinirav-myversion,coltonfisher/coltonfisher-growl,doshinirav/doshinirav-myversion,coltonfisher/coltonfisher-growl,coltonfisher/coltonfisher-growl,doshinirav/doshinirav-myversion,coltonfisher/coltonfisher-growl