recognize C2 Logbook summary

rowers/views.py

@@ -3733,6 +3733,13 @@ def workout_upload_view(request,message=""):
                     f2 = z.extract(z.namelist()[0],path='media/')
                 fileformat = fileformat[2]
                 os.remove(f_to_be_deleted)
+
+            if fileformat == 'c2log':
+                message = "This C2 logbook summary does not contain stroke data. Please download the Export Stroke Data file from the workout details on the C2 logbook."
+		url = reverse(workout_upload_view,
+			      args=[str(message)])
+		response = HttpResponseRedirect(url)
+                return response
             
 	    if fileformat == 'unknown':
 		message = "We couldn't recognize the file type"