Initialise $error_message in seamless login function #25
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$error_message was undefined if there was no error, as it wasn't being initialised. Later in the function, it's compared to an empty string, so should be initialised to that value.
The indentation in the echolink_ess_oauth_seamless_login function was inconsistent (a mix of tabs and spaces, as well as different amounts of indentation on different lines), which made it hard to read.
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$error_message was undefined if there was no error, as it wasn't being initialised. Later in the function, it's compared to an empty string, so should be initialised to that value.
The second commit makes this function more readable by making the indentation consistent (and conform to Moodle coding style); the rest of locallib.php could do with similar treatment, but I've only fixed the indentation in the function I was already working on for now.