corrected some tests

mustang/pom.xml

@@ -3,12 +3,12 @@
 	<parent>
 		<groupId>com.github.rayman2200</groupId>
 		<artifactId>mustang-sample-project</artifactId>
-		<version>1.1.3-SNAPSHOT</version>
+		<version>1.2.1-SNAPSHOT</version>
 	</parent>
 
 	<groupId>org.mustangproject.ZUGFeRD</groupId>
 	<artifactId>mustang</artifactId>
-	<version>1.2.0</version>
+	<version>1.2.1-SNAPSHOT</version>
 	<packaging>jar</packaging>
 
 	<name>Mustang</name>

mustang/src/test/java/org/mustangproject/ZUGFeRD/MustangReaderWriterEdgeTest.java

@@ -111,6 +111,13 @@ public class MustangReaderWriterEdgeTest extends TestCase implements IZUGFeRDExp
     return new Contact();
   }
 
+
+  @Override
+  public String getOwnOrganisationFullPlaintextInfo()
+  {
+    return null;
+  }
+  
   @Override
   public IZUGFeRDExportableItem[] getZFItems()
   {

mustang/src/test/java/org/mustangproject/ZUGFeRD/MustangReaderWriterTest.java

@@ -111,6 +111,12 @@ public class MustangReaderWriterTest extends TestCase implements IZUGFeRDExporta
     return new Contact();
   }
 
+  @Override
+  public String getOwnOrganisationFullPlaintextInfo()
+  {
+    return null;
+  }
+
   @Override
   public IZUGFeRDExportableItem[] getZFItems()
   {