autotune carb_ratio null check (#450)

* if carb_ratio is null buy we have a valid carb_ratios object, use that

* if carb_ratio is null buy we have a valid carb_ratios object, use that

* if profile.json contains null carb_ratio use profile.pump.json

* Revert "if carb_ratio is null buy we have a valid carb_ratios object, use that"

This reverts commit 687edb8.

* Revert "if carb_ratio is null buy we have a valid carb_ratios object, use that"

This reverts commit 35d506e.

* check for carb_ratio==null if oref0-autotune-core fails

bin/oref0-autotune.sh

@@ -215,10 +215,15 @@ do
     # Autotune  (required args, <autotune/glucose.json> <autotune/autotune.json> <settings/profile.json>), 
     # output autotuned profile or what will be used as <autotune/autotune.json> in the next iteration
     echo "oref0-autotune-core autotune.$run_number.$i.json profile.json profile.pump.json > newprofile.$run_number.$i.json"
-    oref0-autotune-core autotune.$run_number.$i.json profile.json profile.pump.json > newprofile.$run_number.$i.json || die "Could not run oref0-autotune-core autotune.$run_number.$i.json profile.json profile.pump.json"
-
-    # Copy tuned profile produced by autotune to profile.json for use with next day of data
-    cp newprofile.$run_number.$i.json profile.json
+    if ! oref0-autotune-core autotune.$run_number.$i.json profile.json profile.pump.json > newprofile.$run_number.$i.json; then
+        if cat profile.json | jq --exit-status .carb_ratio==null; then
+            echo "ERROR: profile.json contains null carb_ratio: using profile.pump.json"
+            cp profile.pump.json profile.json
+            exit
+        else
+            die "Could not run oref0-autotune-core autotune.$run_number.$i.json profile.json profile.pump.json"
+        fi
+    fi
 
   done # End Date Range Iteration
 done # End Number of Runs Loop