Fix selection of HABPanel panel (#1214)

and one NPE.

Fixes #1207

Signed-off-by: mueller-ma <mueller-ma@users.noreply.github.com>

mobile/src/main/java/org/openhab/habdroid/ui/activity/ContentController.java

@@ -26,6 +26,7 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewStub;
+import android.webkit.WebChromeClient;
 import android.webkit.WebResourceError;
 import android.webkit.WebResourceRequest;
 import android.webkit.WebView;
@@ -720,7 +721,7 @@ public abstract class ContentController implements PageConnectionHolderFragment.
             TextView error = view.findViewById(R.id.empty_message);
             error.setText(getString(mErrorMessage));
             if (savedInstanceState != null) {
-                loadWebsite(savedInstanceState.getString(KEY_CURRENT_URL, ""));
+                loadWebsite(savedInstanceState.getString(KEY_CURRENT_URL, mUrltoLoad));
             } else {
                 loadWebsite();
             }
@@ -728,8 +729,10 @@ public abstract class ContentController implements PageConnectionHolderFragment.
 
         @Override
         public void onSaveInstanceState(@NonNull Bundle outState) {
+            if (mWebview != null) {
                 outState.putString(KEY_CURRENT_URL, mWebview.getUrl());
             }
+        }
 
         private void loadWebsite() {
             loadWebsite(mUrltoLoad);
@@ -782,6 +785,7 @@ public abstract class ContentController implements PageConnectionHolderFragment.
                     updateViewVisibility(true, false);
                 }
             });
+            mWebview.setWebChromeClient(new WebChromeClient());
             mWebview.getSettings().setDomStorageEnabled(true);
             mWebview.getSettings().setJavaScriptEnabled(true);
             mWebview.loadUrl(url);