Improve handling updates when credentials are added
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When no credendials are entered, do not allow any update attempts (see https://open-tools.net/forum/advanced-ordernumbers-for-woocommerce/5212-solved-update-error.html#7385) -
When update credentials are entered, immediately trigger an update check (https://open-tools.net/forum/advanced-ordernumbers-for-woocommerce/5212-solved-update-error.html#7393)