Temporary fix for JSON null fields

Zutil.iml

@@ -8,7 +8,6 @@
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="libs" level="project" />
     <orderEntry type="module-library" scope="TEST">
       <library name="JUnit4">
         <CLASSES>
@@ -20,5 +19,18 @@
         <SOURCES />
       </library>
     </orderEntry>
+    <orderEntry type="module-library">
+      <library name="libs">
+        <CLASSES>
+          <root url="file://$MODULE_DIR$/libs" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES>
+          <root url="file://$MODULE_DIR$/libs" />
+        </SOURCES>
+        <jarDirectory url="file://$MODULE_DIR$/libs" recursive="false" />
+        <jarDirectory url="file://$MODULE_DIR$/libs" recursive="false" type="SOURCES" />
+      </library>
+    </orderEntry>
   </component>
 </module>