fix: fuzz-test(5)

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

Author: fredbi

.github/workflows/fuzz-test.yml

@@ -48,6 +48,7 @@ jobs:
     name: fuzz test
     runs-on: ubuntu-latest
     needs: [fuzz-matrix]
+    if: ${{ needs.fuzz-matrix.outputs.matrix != '' && needs.fuzz-matrix.outputs.matrix != '[]' }}
     strategy:
       matrix:
         include: ${{ fromJSON(needs.fuzz-matrix.outputs.matrix) }}