Automated cherry pick of #376: fix: flowman nil pointer panic#379

swordqiu merged 1 commit intoyunionio:release/4.0.0yunionio/sdnagent:release/4.0.0from

swordqiu:automated-cherry-pick-of-#376-upstream-release-4.0.0swordqiu/sdnagent:automated-cherry-pick-of-#376-upstream-release-4.0.0Copy head branch name to clipboard