When creating a new plan is failed because of following error:

The new plan still can be shown on the plans page, migration can be started, VM could be imported successfully.
If creating a new plan is failed, the plan shouldn't be shown on the plans page.
Steps to reproduce:
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Create a non cluster admin user
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Create a role with following rules:

Note that there is no 'delete' verb on networkmaps
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Bind the user with the role
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Log into cluster with the user, and create a new plan