Improve back button function (#47)

Closes: #44

Signed-off-by: Justin Georgi <justin.georgi@gmail.com>

Reviewed-on: Georgi_Lab/ALVINN_f7#47

src/pages/detect.vue

@@ -1,7 +1,7 @@
 <template>
   <f7-page name="detect">
     <!-- Top Navbar -->
-    <f7-navbar :sliding="false" back-link="Back">
+    <f7-navbar :sliding="false" back-link="true" back-link-url="/" back-link-force>
       <f7-nav-title sliding>{{ regions[activeRegion] }}</f7-nav-title>
       <f7-nav-right>
         <f7-link icon-ios="f7:menu" icon-md="material:settings" :panel-open="`#${detectorName}-settings`"></f7-link>
@@ -24,6 +24,7 @@
           @delete="deleteChip(result.resultIndex)"
           :style="chipGradient(result.confidence)"
         />
+        <span v-if="showResults.filter( r => { return r.aboveThreshold && r.isSearched && !r.isDeleted }).size == 0">No results.</span>
       </div>
       <f7-segmented class="image-menu" raised>
         <f7-button popover-open="#region-popover">