Update PathMapping.qll

Author: asgerf

javascript/ql/lib/semmle/javascript/internal/paths/PathMapping.qll

@@ -18,16 +18,16 @@ abstract class PathMapping extends Locatable {
    * Holds if imports paths exactly matching `pattern` should be redirected to `newPath`
    * resolved relative to `newContext`.
    */
-  abstract predicate hasExactPathMapping(string pattern, Container newContext, string newPath);
+  predicate hasExactPathMapping(string pattern, Container newContext, string newPath) { none() }
 
   /**
    * Holds if imports paths starting with `pattern` should have the matched prefix replaced by `newPath`
    * and then resolved relative to `newContext`.
    */
-  abstract predicate hasPrefixPathMapping(string pattern, Container newContext, string newPath);
+  predicate hasPrefixPathMapping(string pattern, Container newContext, string newPath) { none() }
 
   /** Holds if non-relative paths in affected files should be resolved relative to `base`. */
-  abstract predicate hasBaseUrl(Container base);
+  predicate hasBaseUrl(Container base) { none() }
 }
 
 /**