Show error if there's no secret to encode #1580
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Description of the change
Kubeseal will throw an error when trying to seal no secrets. This will happen when the file is empty or invalid, and the error suggests the user to check the file encoding as this seems to be a common issue especially in some versions of Windows #1410 #1560
Benefits
Give feedback to the user to help debugging a common issue
Possible drawbacks
Kubeseal will now throw an error where it previously just silently succeeded with no output
Applicable issues