site resolver: add null check when resolveLoadable returns null.


#475

Clover/app/src/main/java/org/floens/chan/core/site/SiteResolver.java

@@ -111,14 +111,16 @@ public class SiteResolver {
 
         for (Site site : siteRepository.all().getAll()) {
             if (site.resolvable().respondsTo(httpUrl)) {
-                Loadable resolved = loadableProvider.get(
-                        site.resolvable().resolveLoadable(site, httpUrl));
+                Loadable resolvedLoadable = site.resolvable().resolveLoadable(site, httpUrl);
+                if (resolvedLoadable != null) {
+                    Loadable resolved = loadableProvider.get(resolvedLoadable);
 
                     if (resolved != null) {
                         return new LoadableResult(resolved);
                     }
                 }
             }
+        }
 
         return null;
     }