fix InfoDialog

app/src/mobile/java/com/fongmi/android/tv/ui/dialog/InfoDialog.java

@@ -47,6 +47,7 @@ public class InfoDialog {
     }
 
     public InfoDialog url(String url) {
+        if (TextUtils.isEmpty(url)) url = "";
         this.url = url.startsWith("data") ? url.substring(0, Math.min(url.length(), 128)).concat("...") : url;
         return this;
     }
@@ -89,6 +90,7 @@ public class InfoDialog {
     }
 
     private String convert(String url) {
+        if (TextUtils.isEmpty(url)) url = "";
         return url.startsWith("http://127.0.0.1:7777") ? Uri.parse(url).getQueryParameter("url") : url;
     }