Hide interface until load, display loading errors

Signed-off-by: Knut Ahlers <knut@ahlers.me>

example/index.html

@@ -28,6 +28,7 @@
             {{ error }}
           </b-alert>
 
+          <template v-if="loaded">
             <b-form-input
               v-model="passphrase" 
               class="mb-2"
@@ -52,6 +53,7 @@
               placeholder="Paste ciphertext here..."
               v-model="ciphertext"
             ></b-form-textarea>
+          </template>
 
         </b-col>
       </b-row>
@@ -123,7 +125,9 @@
           
           WebAssembly.instantiateStreaming(fetch("openssl.wasm"), go.importObject)
             .then(result => go.run(result.instance))
-            .catch(err => console.error(err))
+            .catch(err => {
+              this.error = err
+            })
         },
       },