Fix: Send only blob to API server.

public/app.js

@@ -114,6 +114,12 @@ var app = new Vue({
                         fingerprint: this.fingerDetails[finger].fingerprint
                     }
                 });
+
+                if (fingerprints.length < 2) {
+                    swal("Oops!", 'Please capture the two fingers for this profile.', "error");
+                    return;
+                }
+                
                 var { data } = await axios.post(
                     this.authenticateUrl(`/uc/fingerprints/${this.staff.reference}`),
                     { fingerprints }