[wip] make autocut.modelPath optional (#4)

* make autocut.modelPath optional

* moved AUTOCUT_MODEL_PATH down

sciencebeam-autocut/templates/deployment.yaml

@@ -25,10 +25,12 @@ spec:
           imagePullPolicy: {{ .Values.image.pullPolicy }}
           command: ['start-autocut.sh']
           env:
-          - name: AUTOCUT_MODEL_PATH
-            value: "{{ .Values.autocut.modelPath }}"
           - name: GUNICORN_WORKERS
             value: "{{ .Values.autocut.workers }}"
+          {{ if .Values.autocut.modelPath }}
+          - name: AUTOCUT_MODEL_PATH
+            value: "{{ .Values.autocut.modelPath }}"
+          {{ end }}
           ports:
             - name: http
               containerPort: 8080