feat:fix loading error cannot be thrown

doric-android/doric/src/main/java/pub/doric/loader/DoricJSLoaderManager.java

@@ -59,7 +59,9 @@ public class DoricJSLoaderManager {
                 return jsLoader.request(source);
             }
         }
-        return new AsyncResult<>("");
+        AsyncResult<String> ret = new AsyncResult<>();
+        ret.setError(new RuntimeException("Cannot find JS Loader for " + source));
+        return ret;
     }
 
 }

doric-iOS/Pod/Classes/Loader/DoricJSLoaderManager.m

@@ -63,6 +63,12 @@ - (void)addJSLoader:(id <DoricLoaderProtocol>)loader {
             *stop = YES;
         }
     }];
+    if (!ret) {
+        ret = [DoricAsyncResult new];
+        [ret setupError:[NSException exceptionWithName:@"LoadingError"
+                                                reason:[NSString stringWithFormat:@"Cannot find JS Loader for %@", source]
+                                              userInfo:nil]];
+    }
     return ret;
 }
 @end