Now returning duplicate database errors.

src/morethantext/cache.rs

@@ -43,7 +43,10 @@ impl Cache {
     pub fn commit(&mut self, data: Store) -> FromCache {
         let store = self.data.get_mut(ENTRY).unwrap();
         for name in data.list() {
-            store.add(name).unwrap();
+            match store.add(name) {
+                Ok(_) => (),
+                Err(err) => return FromCache::Error(err),
+            }
         }
         FromCache::Ok
     }