Fix crash of extension when proxy settings address has wrong format

Signed-off-by: azerr <azerr@redhat.com>

Author: angelozerr

src/settings/proxySettings.ts

@@ -75,7 +75,7 @@ export function getProxySettings(): ProxySettings {
     return null;
   }
   const regexResult = HOST_AND_PORT_EXTRACTOR.exec(proxyAddress);
-  if (!regexResult[1]) {
+  if (!regexResult || !regexResult[1]) {
     return null;
   }
   const host: string = regexResult[1];