Fix bug in 3DOffline task

Problems with making catalogue of offline tasks. not important for now,
but needs revisiting.

pom.xml

@@ -4,7 +4,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.pamguard</groupId>
   <artifactId>Pamguard</artifactId>
-  <version>2.02.04f</version>
+  <version>2.02.04aa</version>
   <name>Pamguard Java12+</name>
   <description>Pamguard for Java 12+, using Maven to control dependcies</description>
 	<url>www.pamguard.org</url>

src/PamController/PamguardVersionInfo.java

@@ -31,12 +31,12 @@ public class PamguardVersionInfo {
 	 * Version number, major version.minorversion.sub-release.
 	 * Note: can't go higher than sub-release 'f'
 	 */
-	static public final String version = "2.02.04a";
+	static public final String version = "2.02.04aa";
 	
 	/**
 	 * Release date
 	 */
-	static public final String date = "23 June 2022";
+	static public final String date = "13 September 2022";
 	
 //	/**
 //	 * Release type - Beta or Core

src/group3dlocaliser/offline/Group3DOfflineTask.java

@@ -30,6 +30,9 @@ public class Group3DOfflineTask extends OfflineTask<PamDataUnit>{
 
 	@Override
 	public String getName() {
+		if (group3DControl == null) {
+			return null;
+		}
 		return group3DControl.getUnitName();
 	}