[GH-226] Fix for decimal fields with precision.

This issue is created automatically through a Github pull request on behalf of bobdenotter:

Url: https://github.com/doctrine/dbal/pull/226

Message:

These fields have no spaces in the length, so the 'explode' fails. Omit the space from the code, and it works. Even if there were a space, it would still work, because of the `array_map("trim", ..)`.

arr(7)
[
"cid" => str(2) "11"
"name" => str(6) "nummer"
"type" => str(7) "DECIMAL"
"notnull" => str(1) "1"
"dflt_value" => str(1) "0"
"pk" => str(1) "0"
"length" => str(4) "18,9"
]