fix: Add null check before updating the body in actions (#21781)

## Description

> When an app which is connected to git which contains empty queries, is
imported shows uncommitted changes on opening git sync modal. This PR
fixes the issue.

Fixes #21742 

## Type of change

- Bug fix (non-breaking change which fixes an issue)


## How Has This Been Tested?

- Manual

### Test Plan
> Add Testsmith test cases links that relate to this PR

### Issues raised during DP testing
> Link issues raised during DP testing for better visiblity and tracking
(copy link from comments dropped on this PR)


## Checklist:
### Dev activity
- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] PR is being merged under a feature flag


### QA activity:
- [ ] Test plan has been approved by relevant developers
- [ ] Test plan has been peer reviewed by QA
- [ ] Cypress test cases have been added and approved by either SDET or
manual QA
- [ ] Organized project review call with relevant stakeholders after
Round 1/2 of QA
- [ ] Added Test Plan Approved label after reveiwing all Cypress test

app/server/appsmith-git/src/main/java/com/appsmith/git/helpers/FileUtilsImpl.java

@@ -697,7 +697,11 @@ public class FileUtilsImpl implements FileInterface {
         if (directory.isDirectory()) {
             for (File dirFile : Objects.requireNonNull(directory.listFiles())) {
                 String resourceName = dirFile.getName();
-                String body = readFileAsString(directoryPath.resolve(resourceName).resolve( resourceName + CommonConstants.TEXT_FILE_EXTENSION));
+                String body = "";
+                Path queryPath = directoryPath.resolve(resourceName).resolve( resourceName + CommonConstants.TEXT_FILE_EXTENSION);
+                if (queryPath.toFile().exists()) {
+                    body = readFileAsString(queryPath);
+                }
                 Object file = readFile(directoryPath.resolve(resourceName).resolve( CommonConstants.METADATA + CommonConstants.JSON_EXTENSION), gson);
                 actionCollectionBodyMap.put(resourceName + keySuffix, body);
                 resource.put(resourceName + keySuffix, file);

app/server/appsmith-server/src/main/java/com/appsmith/server/helpers/GitFileUtils.java

@@ -27,6 +27,7 @@ import com.google.gson.Gson;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.collections.PredicateUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.eclipse.jgit.api.errors.GitAPIException;
 import org.springframework.context.annotation.Import;
 import org.springframework.stereotype.Component;
@@ -419,7 +420,7 @@ public class GitFileUtils {
                 // With the file version v4 we have split the actions and metadata separately into two files
                 // So we need to set the body to the unpublished action
                 String keyName = newAction.getUnpublishedAction().getName() + newAction.getUnpublishedAction().getPageId();
-                if (actionBody != null && (actionBody.containsKey(keyName))) {
+                if (actionBody != null && (actionBody.containsKey(keyName)) && !StringUtils.isEmpty(actionBody.get(keyName))) {
                     // For REMOTE plugin like Twilio the user actions are stored in key value pairs and hence they need to be
                     // deserialized separately unlike the body which is stored as string in the db.
                     if (newAction.getPluginType().toString().equals("REMOTE")) {