Handle the case where there are no executors in the short link (CC @lefticus)

Author: mattgodbolt

lib/clientstate.js

@@ -49,7 +49,7 @@ class ClientStateCompilerOptions {
     }
 }
 
-class ClientStateCompiler { 
+class ClientStateCompiler {
     constructor(jsondata) {
         if (jsondata) {
             this.fromJsonData(jsondata);
@@ -71,7 +71,7 @@ class ClientStateCompiler {
         } else {
             this.id = "";
         }
-        
+
         this.options = jsondata.options;
         this.filters = new ClientStateCompilerOptions(jsondata.filters);
         if (typeof jsondata.libs !== 'undefined') {
@@ -170,9 +170,11 @@ class ClientStateSession {
             this.compilers.push(new ClientStateCompiler(compilerdata));
         });
 
-        jsondata.executors.forEach((executor) => {
-            this.executors.push(new ClientStateExecutor(executor));
-        });
+        if (typeof jsondata.executors !== 'undefined') {
+            jsondata.executors.forEach((executor) => {
+                this.executors.push(new ClientStateExecutor(executor));
+            });
+        }
     }
 
     findOrCreateCompiler(id) {