[Dbix-class] Refusing to commit without a started transaction

[Nick Wellnhofer]

The following commit added a check to txn_commit that throws an 
exception with the message "Refusing to commit without a started 
transaction" if txn_commit is called and a transaction hasn't been started.

http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=dbsrgits/DBIx-Class.git;a=commitdiff;h=7d216b101775c472b012b257d848f50d78b193c8

This happens to break my code. I use AutoCommit => 0, connect to the 
database and sometimes call txn_commit without any previous statements 
sent to the DB. So with DBIx::Class 0.08124 an exception is thrown that 
hasn't been thrown before. I'd expect txn_commit to simply do nothing.

I wonder what the rationale behind that change is. If it is intentional 
how am I supposed to find out whether it's OK to call txn_commit? Simply 
check transaction_depth? Is that part of the official API?

Nick

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