[quota management] MCAD panic in quota release when quota management is not enabled

[asm582]

E0625 19:12:52.286084 1 queuejob_controller_ex.go:1851] [worker] Panic occurred error: runtime error: invalid memory address or nil pointer dereference, stacktrace: goroutine 563 [running]:
runtime/debug.Stack()
/usr/lib/golang/src/runtime/debug/stack.go:24 +0x65
github.com/project-codeflare/multi-cluster-app-dispatcher/pkg/controller/queuejob.(*XController).worker.func1()
/workdir/pkg/controller/queuejob/queuejob_controller_ex.go:1851 +0x4b
panic({0x19186a0, 0x2b7f5e0})
/usr/lib/golang/src/runtime/panic.go:838 +0x207
github.com/project-codeflare/multi-cluster-app-dispatcher/pkg/controller/queuejob.(*XController).manageQueueJob(0xc0006f9200, 0xc001f66000, 0x1)
/workdir/pkg/controller/queuejob/queuejob_controller_ex.go:2174 +0x4794
github.com/project-codeflare/multi-cluster-app-dispatcher/pkg/controller/queuejob.(*XController).syncQueueJob(0xc0006f9200, 0xc001f66000)
/workdir/pkg/controller/queuejob/queuejob_controller_ex.go:1946 +0x1045
github.com/project-codeflare/multi-cluster-app-dispatcher/pkg/controller/queuejob.(*XController).worker.func2({0x1b259e0?, 0xc001f66000?})
/workdir/pkg/controller/queuejob/queuejob_controller_ex.go:1874 +0x35a
k8s.io/client-go/tools/cache.(*FIFO).Pop(0xc0004cbb90, 0xc000830650)
/opt/app-root/src/go/pkg/mod/k8s.io/client-go@v0.20.0/tools/cache/fifo.go:303 +0x1fc
github.com/project-codeflare/multi-cluster-app-dispatcher/pkg/controller/queuejob.(*XController).worker(0xc0008306a0?)
/workdir/pkg/controller/queuejob/queuejob_controller_ex.go:1854 +0x73
k8s.io/apimachinery/pkg/util/wait.BackoffUntil.func1(0x0?)
/opt/app-root/src/go/pkg/mod/k8s.io/apimachinery@v0.20.5/pkg/util/wait/wait.go:155 +0x3e
k8s.io/apimachinery/pkg/util/wait.BackoffUntil(0x0?, {0x1e4eb20, 0xc00164e960}, 0x1, 0xc00047e480)
/opt/app-root/src/go/pkg/mod/k8s.io/apimachinery@v0.20.5/pkg/util/wait/wait.go:156 +0xb6
k8s.io/apimachinery/pkg/util/wait.JitterUntil(0x0?, 0x0, 0x0, 0x0?, 0x0?)
/opt/app-root/src/go/pkg/mod/k8s.io/apimachinery@v0.20.5/pkg/util/wait/wait.go:133 +0x89
k8s.io/apimachinery/pkg/util/wait.Until(0x0?, 0x0?, 0x0?)
/opt/app-root/src/go/pkg/mod/k8s.io/apimachinery@v0.20.5/pkg/util/wait/wait.go:90 +0x25
created by github.com/project-codeflare/multi-cluster-app-dispatcher/pkg/controller/queuejob.(*XController).Run
/workdir/pkg/controller/queuejob/queuejob_controller_ex.go:1617 +0xaea

multi-cluster-app-dispatcher/pkg/controller/queuejob/queuejob_controller_ex.go

Line 2175 in 9035cd7

cc.quotaManager.Release(updateQj)

the fix would be to check if the QM feature is enabled before releasing the quota

[anishasthana]

Already fixed, @asm582 to add PR link

[asm582]

PR #415 Fixes the above issue.