Fix kurt / skew tests for older servers

Author: Kevin D Smith

swat/tests/cas/test_table.py

@@ -1274,9 +1274,8 @@ def test_mean(self):
     def test_skew(self):
         try:
             skew = self.table.skew()
-        except KeyError as msg:
-            if 'skew' in msg:
-                unittest.skip('CAS server does not support skew')
+        except KeyError:
+            return unittest.skip('CAS server does not support skew')
         dfskew = self.get_cars_df().skew()
         self.assertTablesEqual(skew, dfskew, precision=4)
 
@@ -1297,9 +1296,8 @@ def test_skew(self):
     def test_kurt(self):
         try:
             kurt = self.table.kurt()
-        except KeyError as msg:
-            if 'kurt' in msg:
-                unittest.skip('CAS server does not support kurtosis')
+        except KeyError:
+            return unittest.skip('CAS server does not support kurtosis')
         dfkurt = self.get_cars_df().kurt()
         self.assertTablesEqual(kurt, dfkurt, precision=4)