work around azure missing variable quirk

Author: mattip

azure/posix.yml

@@ -97,8 +97,9 @@ jobs:
             ANACONDA_ORG="multibuild-wheels-staging"
             TOKEN="$MAPPED_NUMPY_STAGING_UPLOAD_TOKEN"
           fi
-          if [ "$TOKEN" == "" ]; then
+          if [ "$TOKEN" == "" -o "${TOKEN:0:7}" == "$(NUMPY" ]; then
             echo "##[warning] Could not find anaconda.org upload token in secret variables"
+            TOKEN=""
           fi
           echo "##vso[task.setvariable variable=TOKEN]$TOKEN"
           echo "##vso[task.setvariable variable=ANACONDA_ORG]$ANACONDA_ORG"

azure/windows.yml

@@ -125,8 +125,10 @@ jobs:
             ANACONDA_ORG="multibuild-wheels-staging"
             TOKEN="$MAPPED_NUMPY_STAGING_UPLOAD_TOKEN"
           fi
-          if [ "$TOKEN" == "" ]; then
+          
+          if [ "$TOKEN" == "" -o "${TOKEN:0:7}" == "$(NUMPY" ]; then
             echo "##[warning] Could not find anaconda.org upload token in secret variables"
+            TOKEN=""
           fi
           echo "##vso[task.setvariable variable=TOKEN]$TOKEN"
           echo "##vso[task.setvariable variable=ANACONDA_ORG]$ANACONDA_ORG"