Fix/map initialization (#16)

* fix(map): combine 'init' and 'mapContainer' hooks

* refactor(map-hooks): remove redundant check

Author: mrMetalWood

src/map-provider.tsx

@@ -69,37 +69,27 @@ const GoogleMapProvider = (props: GoogleMapProviderProps): JSX.Element => {
     new GoogleMap(mapOptions);
   };
 
-  // Initializes map on mount
-  useEffect(() => {
-    if (!mapContainer) {
-      return (): void => {};
-    }
-
-    // create new map instance
-    createGoogleMap();
-
-    // Destroy Google Map when component unmounts
-    return (): void => {
-      map && map.destroyComplete();
-    };
-  }, []);
+  // Destroy Google Map when component unmounts
+  useEffect(() => map && map.destroyComplete(), []);
 
   // Destroy and recreate map on mapcontainer change
   useEffect(() => {
-    if (!map || !mapContainer) {
+    if (!mapContainer) {
       return;
     }
 
-    // Destroy old map instance listeners
-    map.destroyListeners();
+    if (map) {
+      // Destroy old map instance listeners
+      map.destroyListeners();
+    }
 
     // create new map instance
     createGoogleMap();
   }, [mapContainer]);
 
   // Destroy and recreate map on language or region change
   useEffect(() => {
-    if (!map || !mapContainer) {
+    if (!map) {
       return;
     }