Fix initial test run without filter

The dotnet test tool started failing at some point when passing an empty filter

Author: kzu

.github/workflows/test/action.yml

@@ -15,12 +15,14 @@ runs:
         warn="\e[0;33m"
         while [ $counter -lt 6 ]
         do
+            # run test and forward output also to a file in addition to stdout (tee command)
             if [ $filter ]
             then
                 echo -e "${warn}Retry $counter for $filter ${reset}"
+                dotnet test --no-build -m:1 --blame-hang --blame-hang-timeout 5m --filter=$filter | tee ./output.log
+            else
+                dotnet test --no-build -m:1 --blame-hang --blame-hang-timeout 5m | tee ./output.log
             fi
-            # run test and forward output also to a file in addition to stdout (tee command)
-            dotnet test --no-build -m:1 --blame-hang --blame-hang-timeout 5m --filter=$filter | tee ./output.log
             # capture dotnet test exit status, different from tee
             exitcode=${PIPESTATUS[0]}
             if [ $exitcode == 0 ]