[Fix] no-adjacent-inline-elements: avoid a crash

Fixes #2575

Author: ljharb

lib/rules/no-adjacent-inline-elements.js

@@ -104,7 +104,7 @@ module.exports = {
         if (!node.callee || node.callee.type !== 'MemberExpression' || node.callee.property.name !== 'createElement') {
           return;
         }
-        if (node.arguments.length < 2) {
+        if (node.arguments.length < 2 || !node.arguments[2]) {
           return;
         }
         const children = node.arguments[2].elements;

tests/lib/rules/no-adjacent-inline-elements.js

@@ -67,18 +67,19 @@ ruleTester.run('no-adjacent-inline-elements', rule, {
     },
     {
       code: '<div><a></a> some text <a></a></div>;',
-      errors: [{message: ERROR}],
       parserOptions
     },
     {
       code: ('React.createElement("div", undefined, [React.createElement("a"), ' +
         '" some text ", React.createElement("a")]);'),
-      errors: [{message: ERROR}],
       parserOptions
     },
     {
       code: 'React.createElement("div", undefined, [React.createElement("a"), " ", React.createElement("a")]);',
-      errors: [{message: ERROR}],
+      parserOptions
+    },
+    {
+      code: 'React.createElement(a, b);',
       parserOptions
     }
   ],