add support for empty catch clause

sokra · sokra · commit 8a38c4bd34fa · 2018-01-01T10:49:19.000+01:00
fixes webpack#6220
diff --git a/lib/Parser.js b/lib/Parser.js
@@ -1598,7 +1598,7 @@ class Parser extends Tapable {
 					this.scope.renames.set(param, null);
 					this.scope.definitions.add(param);
 				});
-			} else {
+			} else if(param) {
 				this.scope.renames.set(param, null);
 				this.scope.definitions.add(param);
 			}

Original file line number	Diff line number	Diff line change
`@@ -1598,7 +1598,7 @@ class Parser extends Tapable {`
`1598`	`1598`	`this.scope.renames.set(param, null);`
`1599`	`1599`	`this.scope.definitions.add(param);`
`1600`	`1600`	`});`
`1601`		`- } else {`
	`1601`	`+ } else if(param) {`
`1602`	`1602`	`this.scope.renames.set(param, null);`
`1603`	`1603`	`this.scope.definitions.add(param);`
`1604`	`1604`	`}`