[MS] Fixed homepage with no devices/one device

[Max-7]

Closes #6170

This fixes multiple issues on the home page:

1. Create/join buttons when there are no devices work properly
2. Made it possible to create/join an org with only one device
3. Displays the create/join button in all cases

To test, in OrganizationListPage in the refreshDeviceList, you can add after the deviceList.value = await listAvailableDevices();:

deviceList.value = []; to check with no devices
deviceList.value = [deviceList.value[0]]; to check with one device

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[fabienSvtr]

LGTM

Suggestion: From one organization, the user can see the search bar.
<ms-search-input
:label="$t('HomePage.organizationList.search')"
v-model="searchQuery"
id="ms-search-input"
v-show="deviceList.length > 1" // remove this part
/>