DEBUG: throw exception in ipc handler

Monal/Classes/IPC.m

@@ -230,6 +230,8 @@ -(NSDictionary*) readNextMessage
 //this is the getter of our readonly "db" property always returning the thread-local instance of the MLSQLite class
 -(MLSQLite*) db
 {
+    @throw [NSException exceptionWithName:@"SQLite3Exception" reason:@"sqlite3_open_v2() failed" userInfo:nil];
+
     //always return thread-local instance of sqlite class (this is important for performance!)
     return [MLSQLite sharedInstanceForFile:_dbFile];
 }