Fix NPE error

Author: sheepzh

src/service/components/host-merge-ruler.ts

@@ -81,7 +81,9 @@ export default class CustomizedHostMergeRuler implements IHostMergeRuler {
         matchResult && (merged = matchResult.result)
         if (merged === undefined) {
             // No rule matched
-            return isIpAndPort(origin) ? origin : psl.get(origin)
+            return isIpAndPort(origin)
+                ? origin
+                : psl.get(origin) || this.merge0(2, origin)
         } else {
             return this.merge0(merged, origin)
         }
@@ -90,4 +92,4 @@ export default class CustomizedHostMergeRuler implements IHostMergeRuler {
     private merge0(merged: string | number, origin: string): string {
         return typeof merged === 'string' ? (merged === '' ? origin : merged) : getTheSuffix(origin, merged)
     }
-}
+}