Test: An missing source causes a fail in debug mode.
Test: An missing source causes a fail in debug mode.

This change was made before the 0.6 release.

scorphus/webassets,aconrad/webassets,glorpen/webassets,heynemann/webassets,florianjacob/webassets,wijerasa/webassets,heynemann/webassets,0x1997/webassets,JDeuce/webassets,john2x/webassets,JDeuce/webassets,aconrad/webassets,florianjacob/webassets,scorphus/webassets,john2x/webassets,glorpen/webassets,0x1997/webassets,aconrad/webassets,glorpen/webassets,wijerasa/webassets,heynemann/webassets