FS#2090 plugin task, function _notify in class helper_plugin

See also FS#2084: This error occurs with other plugins too, e.g. task plugin.

Beside of this, the function _notify($task) in helper.php seems to be faulty:

line 318:
if ((!$conf['subscribers']) && (!$conf['notify'])) return;

'return' will be reached only, when both subscribers AND notify are 0/undefined. However, 'return' should be executed if subscribers OR notify are 0/undefined. So, the line should read as:
if ((!$conf['subscribers']) || (!$conf['notify'])) return;

line 320:
if ((empty($bcc)) && (!$conf['notify'])) return;

Again, 'return' will be reached only if both conditions are true. Moreover, the repeated test !$conf['notify'] can be omitted, due to (my new) line 318. So, this line should read as:
if (empty($bcc)) return;

FS#2090 plugin task, function _notify in class helper_plugin_task

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