Tests: fixed test_java_conf_error to pass with "--modules=" option.

test/test_java_application.py

@@ -24,6 +24,7 @@ class TestJavaApplication(TestApplicationJava):
                             "working_directory": self.current_dir
                             + "/java/empty",
                             "webapp": self.testdir + "/java",
+                            "unit_jars": self.testdir + "/no_such_dir",
                         }
                     },
                 }