Fix fetch issue in android cordova (#99)

Tensorflow fetch failed on android with basic configuration.  More specific protocol and location for model.json required.

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

Reviewed-on: Georgi_Lab/ALVINN_f7#99

src/pages/detect.vue

@@ -333,6 +333,7 @@
           this.detectorName = 'thorax'
           this.classesList = thoraxClasses
           this.modelLocation = '../models/thorax_tfwm/model.json'
+          this.modelLocationCordova = 'https://localhost/models/thorax_tfwm/model.json'
           break;
         case 'abdomen':
           this.activeRegion = 1
@@ -375,8 +376,11 @@
       } else {
         self.modelLoading = true
         self.detectorLabels = self.classesList.map( l => { return {'name': l, 'detect': true} } )
-        self.loadModel(self.modelLocation).then(() => {
+        self.loadModel(self.isCordova ? self.modelLocationCordova : self.modelLocation).then(() => {
           self.modelLoading = false
+        }).catch((e) => {
+          console.log(e.message)
+          f7.dialog.alert(`ALVINN AI model error: ${e.message}`)
         })
       }
       window.onresize = (e) => { this.selectChip('redraw') }
@@ -449,6 +453,9 @@
             self.detecting = false
             self.resultData = dets
             self.uploadDirty = true
+          }).catch((e) => {
+          console.log(e.message)
+          f7.dialog.alert(`ALVINN structure finding error: ${e.message}`)
         })
         }
       },