GUACAMOLE-1632: Don't fill empty lines with spaces. #529
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Little issue in #523: the last buffer column is buffer_row->length - 1 and not buffer_row->length.
![image](https://private-user-images.githubusercontent.com/107032768/340961835-4b81b7e9-ea27-4da6-b981-a82153640ed0.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3Mzk4OTUxNjYsIm5iZiI6MTczOTg5NDg2NiwicGF0aCI6Ii8xMDcwMzI3NjgvMzQwOTYxODM1LTRiODFiN2U5LWVhMjctNGRhNi1iOTgxLWE4MjE1MzY0MGVkMC5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMjE4JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDIxOFQxNjA3NDZaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1mOWExYTg1MWVmYmVjZmViMjcxNDMwZjNkZWFmMmJjN2Q5NWU1NmRkYTgyMzAwMTIxNTA4NTUyMTJlMWViZDFmJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.b5bl9fPG8ivTqE2NVfcbwOCJtWK2JQnMBzej88D-5lg)
We can sometimes find other values than 0 in this column which is not part of the buffer content and this implies that the row is entirely filled with spaces in the clipboard.
Example: