Avoid "no transaction" exception

app/src/main/java/at/bitfire/davdroid/DavService.java

@@ -291,8 +291,8 @@ public class DavService extends Service {
                         info.selected = true;
                 }
 
+                db.beginTransactionNonExclusive();
                 try {
-                    db.beginTransactionNonExclusive();
                     saveHomeSets(homeSets);
                     saveCollections(collections.values());
                     db.setTransactionSuccessful();

cert4android

@@ -1 +1 @@
-Subproject commit 56a51bf019d4e05aef5e15c352a1d791bc8e45bf
+Subproject commit d5fae5d695edbaba9da230679a8313e238f34bf4