fix possible npe, #7677

Author: wangmingliang-ms

PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-resource-connector-lib/src/main/java/com/microsoft/azure/toolkit/intellij/facet/AzureFacetEditorPanel.java

@@ -10,6 +10,7 @@
 
 import javax.annotation.Nonnull;
 import javax.swing.*;
+import java.util.Optional;
 
 public class AzureFacetEditorPanel {
     @Nonnull
@@ -39,7 +40,7 @@ private void createUIComponents() {
         this.dotAzureDirInput = new TextFieldWithBrowseButton(new JTextField());
         final FileChooserDescriptor descriptor = new FileChooserDescriptor(false, true, false, false, false, false)
             .withFileFilter(file -> file.isDirectory() && file.findChild("profiles.xml") != null);
-        descriptor.setRoots(ProjectUtil.guessModuleDir(this.module));
+        Optional.ofNullable(ProjectUtil.guessModuleDir(this.module)).ifPresent(descriptor::setRoots);
         this.dotAzureDirInput.setEditable(false);
         this.dotAzureDirInput.setEnabled(false);
         // noinspection DialogTitleCapitalization