cherry pick: 0 = false, check for key exists. stop moving managers

[ikiris]

Pull request summary

Description:

Manager was getting pushed, debuged to this logic bug that 0 fails the test intended to check if the element exists. Replaced with equivalent test logic.

Fixed:

MovePush check incorrectly treating manager 0 value as nonexistent and taking default 10 causing unintended push.

Testing checklist:

• [x] Changes are backward-compatible OR version migration code is included
• [x] Codebase compiles with current tsconfig configuration
• [x] Tested changes on PUBLIC server OR changes are trivial (e.g. typos)

[zGeneral]

in the master branch, the manager had a value of 1 for a priority, this PR fixes it.