More graceful handling of a camera not being available

[jbeardon]

Feature Request

Problem Description

With some regularity, the cameras on my K1 Max (sic) printers become unavailable until reboot (which may not be for days). Mobileraker displays a bunch of errors when this occurs.

Proposed Solution

Replace camera related errors with a simple 'camera unavailable' indicator.

Alternatives Considered

Replacing the crappy printers but hey, I'm stuck with them!

Additional Context

Add any screenshots, examples, or additional context to help us understand your feature request better.

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Checklist
To help us understand your feature request, please ensure you've covered the following points:

• Provided a clear description of the problem you're facing.
• Clearly outlined the proposed solution or feature.
• Mentioned any alternative solutions or ideas you've considered.
• Included any relevant context or supporting materials.

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