Fix issue 9059

[MarcialRosales]

This issue, #9059, occurs when the ldap plugin submits a query to retrieve an LDAP attribute and that attribute has a non-ascii character such as ß. When the plugin receives a binary representation of a string with a non-ascii character, it treated as a list of strings when it was a list of characters. It tried to join those characters with string:join function. When this function encounter the non-ascii characters, it failed to concatenate it and threw the exception badarg.

Proposed Changes

Use list comprehensions instead of string:join to produce a string representation of the attribute's value which can be a single string -with only ascii characters or mix of ascii and non-ascii- or multiple strings.

Types of Changes

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• Bug fix (non-breaking change which fixes issue #NNNN)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause an observable behavior change in existing systems)
• Documentation improvements (corrections, new content, etc)
• Cosmetic change (whitespace, formatting, etc)
• Build system and/or CI

[michaelklishin]

The effectiveness of this change was confirmed in #9059 by the reporter.