[Bugfix] Fixed additional Translation, Configuration Issues

- Fixed translation messages
   - FlightConfiguration, MotorConfiguration
   - correctly display under debug & production
- Fixed exception throw when adding empty-MotorConfiguration to a FlightConfig

core/resources/l10n/messages.properties

@@ -1477,7 +1477,10 @@ MotorMount.IgnitionEvent.short.EJECTION_CHARGE = Ejection charge
 MotorMount.IgnitionEvent.short.BURNOUT = Burnout
 MotorMount.IgnitionEvent.short.NEVER = Never
 
-MotorMount.NoMotors = [No Motors Defined]
+FlightConfiguration.noMotors = No motors
+
+MotorConfiguration.empty = None
+
 
 !ComponentIcons
 ComponentIcons.Stage = Axial Stage

core/src/net/sf/openrocket/file/openrocket/savers/RocketSaver.java

@@ -41,13 +41,13 @@ public class RocketSaver extends RocketComponentSaver {
 		}
 		
 		
-		// Motor configurations
+		// Flight configurations
 		for (FlightConfigurationId fcid : rocket.getIds()) {
 			FlightConfiguration flightConfig = rocket.getFlightConfiguration(fcid); 
 			if (fcid == null)
 				continue;
 			
-			// these are actually FlightConfigurationIds, buuuuuuuuuut backwards-compatible tags.
+			// these are actually FlightConfigurationIds, but the old tag name is preserved for backwards-compatibility.
 			String str = "<motorconfiguration configid=\"" + fcid.key + "\"";
 			// if the configuration is the default, add the tag
 			if ( rocket.getSelectedConfiguration().equals( flightConfig )){

core/src/net/sf/openrocket/motor/MotorConfiguration.java

@@ -1,10 +1,12 @@
 package net.sf.openrocket.motor;
 
+import net.sf.openrocket.l10n.Translator;
 import net.sf.openrocket.rocketcomponent.FlightConfigurableParameter;
 import net.sf.openrocket.rocketcomponent.FlightConfigurationId;
 import net.sf.openrocket.rocketcomponent.InnerTube;
 import net.sf.openrocket.rocketcomponent.MotorMount;
 import net.sf.openrocket.rocketcomponent.RocketComponent;
+import net.sf.openrocket.startup.Application;
 import net.sf.openrocket.util.Coordinate;
 import net.sf.openrocket.util.Inertia;
 
@@ -14,7 +16,7 @@ import net.sf.openrocket.util.Inertia;
  */
 public class MotorConfiguration implements FlightConfigurableParameter<MotorConfiguration> {
 	
-	public static final String EMPTY_DESCRIPTION = "Empty Motor Configuration".intern();
+	private static final Translator trans = Application.getTranslator();
 	
 	private final MotorMount mount;
 	private final FlightConfigurationId fcid;
@@ -60,7 +62,7 @@ public class MotorConfiguration implements FlightConfigurableParameter<MotorConf
 
 	public String toMotorDescription(){
 		if( motor == null ){
-			return "<Empty>";
+			return trans.get("empty");
 		}else{
 			return this.motor.getDesignation() + "-" + (int)this.getEjectionDelay();
 		}

core/src/net/sf/openrocket/rocketcomponent/FlightConfiguration.java

@@ -314,7 +314,7 @@ public class FlightConfiguration implements FlightConfigurableParameter<FlightCo
 			}
 		}
 		if( 0 == activeMotorCount ){
-			return trans.get("MotorMount.NoMotors");
+			return trans.get("noMotors");
 		}
 		buff.append("]");
 		return buff.toString();
@@ -331,7 +331,7 @@ public class FlightConfiguration implements FlightConfigurableParameter<FlightCo
 	 */
 	public void addMotor(MotorConfiguration motorConfig) {
 		if( motorConfig.isEmpty() ){
-			throw new IllegalArgumentException("MotorInstance is empty.");
+			log.error("attempt to add an empty motorConfig! ignoring. ", new IllegalArgumentException("empty MotorInstance: "+motorConfig.toDebugDetail()));
 		}
 
 		this.motors.put( motorConfig.getID(), motorConfig);