Steps/UploadCodeCoverage.yml: Conditionalize upload on codecov token presence

Some repos may not upload to codecov for various reasons. Those repos
won't set the code coverage token so conditionalize the upload steps
on the token.

Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>

Author: makubacki

Steps/UploadCodeCoverage.yml

@@ -9,10 +9,6 @@
 ##
 
 parameters:
-- name: codecov_token
-  displayName: Codecov.io Token
-  type: string
-  default: ''
 - name: report_dir
   displayName: Code Coverage Report
   type: string
@@ -31,9 +27,11 @@ steps:
   - script: |
       pip install requests
     displayName: Install Python Dependencies for Codecov Uploader
+    condition: ne(variables['CODECOV_TOKEN'], '')
 
 - task: PythonScript@0
   displayName: Download and Verify Codecov Uploader
+  condition: ne(variables['CODECOV_TOKEN'], '')
   inputs:
     scriptSource: inline
     script: |
@@ -93,6 +91,7 @@ steps:
 
 - task: PythonScript@0
   displayName: Run Codecov Uploader ${{ parameters.flag }}
+  condition: ne(variables['CODECOV_TOKEN'], '')
   env:
     COV_FLAG: ${{ parameters.flag }}
     REPORT_DIR: ${{ parameters.report_dir }}