Update main_py_to_bitly.yml

Author: skysign

.github/workflows/main_py_to_bitly.yml

@@ -14,11 +14,11 @@
           run: |
             echo "zero_length_string=\"\"" >> $GITHUB_ENV
             echo "path_of_main_py=$(git diff --name-only HEAD~1 HEAD | grep '/main\.py')" >> $GITHUB_ENV
-        - name: Existing path of main.py
-          if: ${{ env.zero_length_string }} == ${{ env.path_of_main_py }}
+        - name: Check main.py exists
           run: |
-            echo "No main.py"
-            exit 1
+            if [[${{ env.zero_length_string }} == ${{ env.path_of_main_py }}]]; then
+              echo "No main.py"
+              exit 1
         - name: Decorate path_of_main_py
           run: echo "path_of_main_py=https://github.com/skysign/WSAPT/${{ env.path_of_main_py }}" >> $GITHUB_ENV
         - name: Print path_of_main_py