Gracefully handle removed technologies

src/drivers/webextension/js/driver.js

@@ -275,7 +275,9 @@ const Driver = {
     })
 
     // Remove duplicates
-    cache.detections = cache.detections.concat(detections)
+    cache.detections = cache.detections
+      .concat(detections)
+      .filter(({ technology }) => technology)
 
     cache.detections.filter(
       ({ technology: { name }, pattern: { regex } }, index) =>
@@ -309,7 +311,9 @@ const Driver = {
           ...cache,
           [hostname]: {
             ...Driver.cache.hostnames[hostname],
-            detections: Driver.cache.hostnames[hostname].detections.map(
+            detections: Driver.cache.hostnames[hostname].detections
+              .filter(({ technology }) => technology)
+              .map(
                 ({
                   technology: { name: technology },
                   pattern: { regex, confidence },

src/wappalyzer.js

@@ -34,7 +34,9 @@ const Wappalyzer = {
         let version = ''
         let confidence = 0
 
-        detections.forEach(
+        detections
+          .filter(({ technology }) => technology)
+          .forEach(
             ({ technology: { name }, pattern, version: _version = '' }) => {
               if (name === technology.name) {
                 confidence = Math.min(100, confidence + pattern.confidence)