fix(meta): fix issues regarding favicon.ico fallback

lib/meta/module.js

@@ -102,13 +102,15 @@ function generateMeta (pwa) {
   }
 
   // Icons
-  if (options.favicon && options.icons && options.icons.length > 0) {
+  if (options.icons && options.icons.length > 0) {
     const iconSmall = options.icons[0]
     const iconBig = options.icons[options.icons.length - 1]
 
     // Shortcut icon
-    head.link.push({ rel: 'shortcut icon', href: iconSmall.src })
-    head.link.push({ rel: 'apple-touch-icon', href: iconBig.src, sizes: iconBig.sizes })
+    if (options.favicon) {
+      head.link.push({ rel: 'shortcut icon', href: iconSmall.src })
+      head.link.push({ rel: 'apple-touch-icon', href: iconBig.src, sizes: iconBig.sizes })
+    }
 
     // Launch Screen Image (IOS)
     if (options.mobileAppIOS && pwa._iosSplash) {
@@ -134,14 +136,13 @@ function generateMeta (pwa) {
         })
       }
     }
-  }
-
-  // Favicon.ico as fallback
-  const favicon = join(nuxt.options.srcDir, nuxt.options.dir.static, 'favicon.ico')
-  if (options.favicon && existsSync(favicon)) {
-    // eslint-disable-next-line no-console
-    console.warn('You are using a low quality icon, use icon png. See https://pwa.nuxtjs.org/icon')
-    head.link.push({ rel: 'shortcut icon', href: nuxt.options.router.base + 'favicon.ico' })
+  } else {
+    // favicon.ico as fallback
+    // TODO: Drop support as it is harmful: https://mathiasbynens.be/notes/rel-shortcut-icon
+    const favicon = join(nuxt.options.srcDir, nuxt.options.dir.static, 'favicon.ico')
+    if (existsSync(favicon)) {
+      head.link.push({ rel: 'shortcut icon', href: nuxt.options.router.base + 'favicon.ico' })
+    }
   }
 
   // Title