Percy: fix helm update function for cached sources (and disable for 	       non-cached sources)
Percy: fix helm update function for cached sources (and disable for
	       non-cached sources)

jbalint/banshee-sympatico,jbalint/banshee-sympatico,jbalint/banshee-sympatico,jbalint/banshee-sympatico,jbalint/banshee-sympatico,jbalint/banshee-sympatico,jbalint/banshee-sympatico,jbalint/banshee-sympatico