decorator tests: new skip_if_no_data decorator hickups if call syntax is

wrong (which is fine) so adapt test to use correct syntax

obspy/core/tests/test_trace.py

@@ -1594,7 +1594,7 @@ def test_skip_empty_trace(self):
         tr.resample(400)
         tr.differentiate()
         tr.integrate()
-        tr.taper()
+        tr.taper(max_percentage=0.1)
 
     def test_issue_695(self):
         x = np.zeros(12)