Add support for "remove all properties" in json-prune scriptlet

Related issue:
- uBlockOrigin/uBlock-issues#1545

assets/resources/scriptlets.js

@@ -367,6 +367,10 @@
 // When no "prune paths" argument is provided, the scriptlet is
 // used for logging purpose and the "needle paths" argument is
 // used to filter logging output.
+//
+// https://github.com/uBlockOrigin/uBlock-issues/issues/1545
+// - Add support for "remove everything if needle matches" case
+//
 (function() {
  const rawPrunePaths = '{{1}}';
  const rawNeedlePaths = '{{2}}';
@@ -401,9 +405,15 @@
  }
  const pos = chain.indexOf('.');
  if ( pos === -1 ) {
- const found = owner.hasOwnProperty(chain);
- if ( found === false ) { return false; }
- if ( prune ) {
+ if ( prune === false ) {
+ return owner.hasOwnProperty(chain);
+ }
+ if ( chain === '*' ) {
+ for ( const key in owner ) {
+ if ( owner.hasOwnProperty(key) === false ) { continue; }
+ delete owner[key];
+ }
+ } else if ( owner.hasOwnProperty(chain) ) {
  delete owner[chain];
  }
  return true;