running tests, fixed issues

rowers/interactiveplots.py

@@ -4175,10 +4175,16 @@ def interactive_multiple_compare_chart(ids, xparam, yparam, plottype='line',
                                              compute=compute,
                                              workstrokesonly=workstrokesonly, for_chart=True)
 
+    
+    # check if dataframe not empty
+    if datadf.empty:  # pragma: no cover
+        return ['<p>No non-zero data in selection</p>', '']
+
     datadf['workoutid'] = datadf['workoutid'].astype(int)
     datadf.dropna(axis=1, how='all', inplace=True)
     datadf.dropna(axis=0, how='all', inplace=True)
 
+
     nrworkouts = len(ids)
 
     try:
@@ -4187,11 +4193,11 @@ def interactive_multiple_compare_chart(ids, xparam, yparam, plottype='line',
         try:
             tseconds = datadf.loc[:, xparam]
         except:
-            return ['', '<p>A chart data error occurred</p>', '', 'A chart data error occurred']
+            return ['<p>A chart data error occurred</p>', '']
 
     # check if dataframe not empty
     if datadf.empty:  # pragma: no cover
-        return ['', '<p>No non-zero data in selection</p>', '', 'No non-zero data in selection']
+        return ['<p>No non-zero data in selection</p>', '']
 
 
     if (xparam == 'time'):

rowers/views/workoutviews.py

@@ -1801,8 +1801,6 @@ def virtualevent_compare_view(request, id=0):
                                              promember=promember,
                                              plottype=plottype,
                                              labeldict=labeldict, startenddict=startenddict)
-    script = res[0]
-    div = res[1]
 
     breadcrumbs = [
         {