reader: fix to use the new exceptions handling

Change-Id: Ia206d24d2e3f562479e19be12d68b4492bedf894
diff --git a/android/app/src/main/java/io/v/android/apps/reader/db/SyncbaseDB.java b/android/app/src/main/java/io/v/android/apps/reader/db/SyncbaseDB.java
index b9c2730..9fe3869 100644
--- a/android/app/src/main/java/io/v/android/apps/reader/db/SyncbaseDB.java
+++ b/android/app/src/main/java/io/v/android/apps/reader/db/SyncbaseDB.java
@@ -58,7 +58,7 @@
 import io.v.v23.syncbase.nosql.Syncgroup;
 import io.v.v23.syncbase.nosql.Table;
 import io.v.v23.syncbase.nosql.WatchChange;
-import io.v.v23.verror.Errors;
+import io.v.v23.verror.ExistException;
 import io.v.v23.verror.VException;
 import io.v.v23.vom.VomUtil;
 
@@ -289,10 +289,9 @@
         try {
             group.create(mVContext, spec, new SyncgroupMemberInfo());
             Log.i(TAG, "Syncgroup is created successfully.");
-        } catch (VException e) {
-            if (e.is(Errors.EXIST)) {
+        } catch (ExistException e) {
                 Log.i(TAG, "Syncgroup already exists.");
-            } else {
+        } catch (VException e) {
                 handleError("Syncgroup could not be created: " + e.getMessage());
                 return;
             }