Enphase: support for sparse production.json (evcc-io#17948)

In some cases production.json does not list CT meters, not even as a disabled resource. To support that use case, we need to check the length of array before iterating on, potentially non-existing, keys.

templates/definition/meter/enphase.yaml

@@ -41,7 +41,7 @@ render: |
       password: {{ .token }}
     insecure: true
     {{- end }}
-    jq: if .production[] | select(.measurementType == "production").activeCount >= 1 then .production[] | select(.measurementType == "production").wNow else .production[] | select(.type == "inverters").wNow end
+    jq: if (.production | length) > 1 and (.production[] | select(.measurementType == "production").activeCount >= 1) then .production[] | select(.measurementType == "production").wNow else .production[] | select(.type == "inverters").wNow end
   energy:
     source: http
     uri: http://{{ .host }}/production.json
@@ -51,7 +51,7 @@ render: |
       password: {{ .token }}
     insecure: true
     {{- end }}
-    jq: if .production[] | select(.measurementType == "production").activeCount >= 1 then .production[] | select(.measurementType == "production").whLifetime else .production[] | select(.type == "inverters").whLifetime end
+    jq: if (.production | length) > 1 and (.production[] | select(.measurementType == "production").activeCount >= 1) then .production[] | select(.measurementType == "production").whLifetime else .production[] | select(.type == "inverters").whLifetime end
     scale: 0.001
   {{- end }}
   {{- if eq .usage "battery" }}