Test for empty value and avoid needless space

maven-core/src/main/java/org/apache/maven/exception/DefaultExceptionHandler.java

@@ -149,7 +149,8 @@ public class DefaultExceptionHandler
         }
 
         String message = System.lineSeparator()
-            + "The project " + result.getProjectId() + " (" + result.getPomFile() + ") has "
+            + "The project " + ( result.getProjectId().isEmpty() ? "" : result.getProjectId() + " " )
+            + "(" + result.getPomFile() + ") has "
             + children.size() + " error" + ( children.size() == 1 ? "" : "s" );
 
         return new ExceptionSummary( null, message, null, children );