[MPLUGIN-380] Always include thread safety in report

This closes #51

Author: pzygielo

maven-plugin-tools-generators/src/main/java/org/apache/maven/tools/plugin/generator/PluginXdocGenerator.java

@@ -314,13 +314,12 @@ private void writeGoalAttributes( MojoDescriptor mojoDescriptor, XMLWriter w )
             }
         }
 
-        if ( mojoDescriptor.isThreadSafe() )
-        {
-            addedUl = addUl( w, addedUl );
-            w.startElement( "li" );
-            w.writeMarkup( getString( "pluginxdoc.mojodescriptor.threadSafe" ) );
-            w.endElement(); //li
-        }
+        addedUl = addUl( w, addedUl );
+        w.startElement( "li" );
+        w.writeMarkup( getString( mojoDescriptor.isThreadSafe()
+                ? "pluginxdoc.mojodescriptor.threadSafe"
+                : "pluginxdoc.mojodescriptor.notThreadSafe" ) );
+        w.endElement(); //li
 
         value = mojoDescriptor.getSince();
         if ( StringUtils.isNotEmpty( value ) )

maven-plugin-tools-generators/src/main/resources/pluginxdoc.properties

@@ -60,3 +60,4 @@ pluginxdoc.mojodescriptor.optionalParameters=Optional Parameters
 pluginxdoc.mojodescriptor.parameters=Parameters
 pluginxdoc.mojodescriptor.noParameter=(no parameters)
 pluginxdoc.mojodescriptor.threadSafe=The goal is thread-safe and supports parallel builds.
+pluginxdoc.mojodescriptor.notThreadSafe=The goal is not marked as thread-safe and thus does not support parallel builds.