After applying invalid yaml mac addresses are not released

[kononovn]

Once you apply invalid yaml mac addresses are not released.
Scenario:
Step 1: Apply invalid yaml:
oc apply -f temp_a
The "" is invalid: spec.template.spec.networks: every network must be mapped to an interface

Step 2: Check logs
oc logs kubemacpool-mac-controller-manager-844cd8fbf8-rw6vk -n kubemacpool-system
{"level":"info","ts":1561535723.8990824,"logger":"PoolManager","msg":"mac from pool was allocated for virtual machine","allocatedMac":"02:aa:bf:00:00:01","virtualMachineName":"vma","virtualMachineNamespace":"myproject"}
{"level":"info","ts":1561535723.8990977,"logger":"PoolManager","msg":"mac from pool was allocated for virtual machine","allocatedMac":"02:aa:bf:00:00:02","virtualMachineName":"vma","virtualMachineNamespace":"myproject"}
{"level":"info","ts":1561535723.8991125,"logger":"PoolManager","msg":"mac from pool was allocated for virtual machine","allocatedMac":"02:aa:bf:00:00:03","virtualMachineName":"vma","virtualMachineNamespace":"myproject"}

Step 3: Reapply invalid yaml
oc apply -f temp_a

Step 4: Check logs:
oc logs kubemacpool-mac-controller-manager-844cd8fbf8-rw6vk -n kubemacpool-system
{"level":"info","ts":1561535798.2916842,"logger":"PoolManager","msg":"mac from pool was allocated for virtual machine","allocatedMac":"02:aa:bf:00:00:04","virtualMachineName":"vma","virtualMachineNamespace":"myproject"}
{"level":"info","ts":1561535798.2917054,"logger":"PoolManager","msg":"mac from pool was allocated for virtual machine","allocatedMac":"02:aa:bf:00:00:05","virtualMachineName":"vma","virtualMachineNamespace":"myproject"}
{"level":"info","ts":1561535798.2917206,"logger":"PoolManager","msg":"mac from pool was allocated for virtual machine","allocatedMac":"02:aa:bf:00:00:06","virtualMachineName":"vma","virtualMachineNamespace":"myproject"}
{"level":"info","ts":1561535798.2917743,"logger":"PoolManager","msg":"mac from pool was allocated for virtual machine","allocatedMac":"02:aa:bf:00:00:07","virtualMachineName":"vma","virtualMachineNamespace":"myproject"}

Bug: Once invalid yaml is applied mac addresses are not released.