Allow to start empty device

AttributeCombiner.cpp

@@ -158,12 +158,7 @@ void AttributeCombiner::init_device()
 
 	// Create BLM group
 	deviceGroup = new Tango::Group("DEVGROUP");
-
-	if(deviceList.size()==0) {
-		cerr << "ERROR: DeviceList device property not defined" << endl;
-		exit(0);
-	}
-
+	
 	errorStack.clear();
 	for (int i = 0; i < (int)deviceList.size(); i++) {
 		// Populate error vector
@@ -453,11 +448,13 @@ void AttributeCombiner::add_dynamic_attributes()
 	}
 
 	// States attribute
-	vector<string> stateName;
-	stateName.push_back("State");
-	DynSpectrumAttribute *stateAtt = new DynSpectrumAttribute("States", Tango::DEV_STATE, deviceList.size(), Tango::READ, false);
-	add_attribute(stateAtt);
-	attMap.add("States", stateName, false, Tango::DEV_STATE, Tango::READ, false, "None", false);
+	if( deviceList.size()>0 ) {
+		vector<string> stateName;
+		stateName.push_back("State");
+		DynSpectrumAttribute *stateAtt = new DynSpectrumAttribute("States", Tango::DEV_STATE, deviceList.size(),Tango::READ, false);
+		add_attribute(stateAtt);
+		attMap.add("States", stateName, false, Tango::DEV_STATE, Tango::READ, false, "None", false);
+	}
 	
 	/*----- PROTECTED REGION END -----*/	//	AttributeCombiner::add_dynamic_attributes
 }