fix: null reference when parsing error responses (fixes #1749)

components/lenses/ResponseBodyRenderer.vue

@@ -10,9 +10,9 @@
       <component :is="lens.renderer" :response="response" />
     </SmartTab>
     <SmartTab
-      v-if="Object.keys(response.headers).length !== 0"
+      v-if="headerLength"
       id="headers"
-      :label="`Headers \xA0 • \xA0 ${Object.keys(response.headers).length}`"
+      :label="`Headers \xA0 • \xA0 ${headerLength}`"
     >
       <LensesHeadersRenderer :headers="response.headers" />
     </SmartTab>
@@ -31,7 +31,14 @@ export default {
     response: { type: Object, default: () => {} },
   },
   computed: {
+    headerLength() {
+      if (!this.response || !this.response.headers) return 0
+
+      return Object.keys(this.response.headers).length
+    },
     validLenses() {
+      if (!this.response) return []
+
       return getSuitableLenses(this.response)
     },
   },

pages/index.vue

@@ -1626,10 +1626,11 @@ export default {
       // tests
       const syntheticResponse = {
         status: this.response.status,
-        body: this.response.body,
-        headers: this.response.headers,
+        body: this.response.body || new Uint8Array([]),
+        headers: this.response.headers || [],
       }
 
+      this.response.body = this.response.body || new Uint8Array([])
       // Parse JSON body
       if (
         syntheticResponse.headers["content-type"] &&