correcting no avghr and no maxhr workouts

rowers/dataprep.py

@@ -2353,7 +2353,20 @@ def workout_trimp(w):
         r.hrftp = int(hrftp)
         r.save()
 
-        
+
+    if w.averagehr is None:
+        rowdata = rdata(w.csvfilename)
+
+        try:
+            avghr = rowdata.df[' HRCur (bpm)'].mean()
+            maxhr = rowdata.df[' HRCur (bpm)'].max()
+        except KeyError:
+            avghr = None
+            maxhr = None
+
+        w.averagehr = avghr
+        w.maxhr = maxhr
+        w.save()
 
     job = myqueue(
         queuehigh,