simplify evaluation of --cython-only option in test runner

runtests.py

@@ -746,6 +746,7 @@ class CythonRunTestCase(CythonCompileTestCase):
                 self.success = False
                 self.runCompileTest()
                 failures, errors = len(result.failures), len(result.errors)
+                if not self.cython_only:
                     self.run_tests(result)
                 if failures == len(result.failures) and errors == len(result.errors):
                     # No new errors...
@@ -761,7 +762,6 @@ class CythonRunTestCase(CythonCompileTestCase):
             pass
 
     def run_tests(self, result):
-        if not self.cython_only:
         self.run_doctests(self.module, result)
 
     def run_doctests(self, module_name, result):
@@ -926,7 +926,6 @@ class CythonUnitTestCase(CythonRunTestCase):
         return "compiling (%s) tests in %s" % (self.language, self.module)
 
     def run_tests(self, result):
-        if not self.cython_only:
         unittest.defaultTestLoader.loadTestsFromName(self.module).run(result)
 
 
@@ -960,8 +959,6 @@ class CythonPyregrTestCase(CythonRunTestCase):
         self.run_doctests(module, result)
 
     def run_tests(self, result):
-        if self.cython_only:
-            return
         try:
             from test import support
         except ImportError: # Python2.x