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Fix the check for Mac address in kef integration (#106072) It might be due to an update of `getmac` dependency in some case the mac was resolved to "00:00:00:00:00:00" instead of the anticipated `None`. With that the original bug #47678 where a duplicated entity would be created in case of HA is restarted while the KEF speaker is offline came back. The PR #52902 was applied back in time to fix that issue. Now, this change is a continuation of the previous efforts. The solution was tested for about two months and it does address the bug with creating duplicated entities in case of KEF speakers being offline.