866: IndexNotReadyException while opening a context menu

Author: Iamwade

src/com/magento/idea/magento2plugin/indexes/ModuleIndex.java

@@ -5,6 +5,7 @@
 
 package com.magento.idea.magento2plugin.indexes;
 
+import com.intellij.openapi.project.DumbService;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VfsUtilCore;
 import com.intellij.openapi.vfs.VirtualFile;
@@ -120,6 +121,10 @@ private List<String> getNames(
     public @Nullable PsiDirectory getModuleDirectoryByModuleName(final String moduleName) {
         final FileBasedIndex index = FileBasedIndex
                 .getInstance();
+
+        if (DumbService.getInstance(project).isDumb()) {
+            return null;
+        }
         final Collection<VirtualFile> files = index.getContainingFiles(
                 ModuleNameIndex.KEY,
                 moduleName,