Fixed Bug 8318

Fixed @at crash as described in 8318.
Related to 4147d9f7966e
Special Thanks to Haruna! <3
http://hercules.ws/board/tracker/issue-8318-something-crash-with-autotrade/

Signed-off-by: shennetsind <ind@henn.et>
Fixed @at with buyingstore issue

Where it'd not leave channels upon starting autotrade (for buying stores only), no report to link -- noticed while working on a different report.

Signed-off-by: shennetsind <ind@henn.et>
Fixed Bug 8138

@at persistency no longer sends characters to save point when starting autotrade on a nosave location.
http://hercules.ws/board/tracker/issue-8138-autotrade-teleports-char-to-the-savepoint/

Signed-off-by: shennetsind <ind@henn.et>