Only show repeat if data is present

.gitignore

@@ -63,4 +63,5 @@ target/
 
 #Influx data
 engine/
-influxd.bolt
+influxd.bolt
+influxdb

templates/index.html

@@ -54,7 +54,9 @@
       </div>
     </div><br>
     <input type="submit" value="Go">
+    {% if data %}
     <a href="{{ url_for('repeat_last_odometer', odometer=data[0]['odometer'] ) }}">Repeat</a>
+    {% endif %}
   </div>
 </form>
 <br>