Fix minor issue in output of test runner.

* build/run_tests.py
  (TestHarness.run): Add missing space to 'There were some XML validation
   errors, checking <FILE>' message.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1936114 13f79535-47bb-0310-9956-ffa450edef68

Author: Ivan Zhakov

build/run_tests.py

@@ -670,7 +670,7 @@ def printxfail(x):
 
     xml_error_list = [x for x in log_lines if x[:8] == 'E: XML: ']
     if xml_error_list:
-      print('There were some XML validation errors, checking' + self.logfile)
+      print('There were some XML validation errors, checking ' + self.logfile)
       for x in sorted(set(xml_error_list)):
         sys.stdout.write(x[3:])