Fixed issue where validation was giving INVALID_TYPE instead of MISSING_IN_REQUEST if path variable is not present in transaction

lib/schemaUtils.js

@@ -3233,6 +3233,11 @@ module.exports = {
         return cb(null, mismatches);
       }
 
+      // don't validate variable if not present in transaction
+      if (!pathVar._varMatched) {
+        return cb(null, mismatches);
+      }
+
       // assign parameter example(s) as schema examples
       this.assignParameterExamples(schemaPathVar);
 
@@ -3264,7 +3269,9 @@ module.exports = {
 
       // go through required schemaPathVariables, and params that aren't found in the given transaction are errors
       _.each(schemaPathVariables, (pathVar) => {
-        if (!_.find(determinedPathVariables, (param) => { return param.key === pathVar.name; })) {
+        if (!_.find(determinedPathVariables, (param) => {
+          return param.key === pathVar.name && param._varMatched;
+        })) {
 
           // assign parameter example(s) as schema examples;
           this.assignParameterExamples(pathVar);

lib/schemapack.js

@@ -447,6 +447,8 @@ class SchemaPack {
                 return transactionPathVar.key === pathVar.key;
               });
               pathVar.value = _.get(mappedPathVar, 'value', pathVar.value);
+              // set _varMatched flag which represents if variable was found in transaction or not
+              pathVar._varMatched = !_.isEmpty(mappedPathVar);
             });
 
             // resolve $ref in all parameter objects if present