Potentially unsafe code

[NickNevzorov]

I don't know why it's done this way, but if the user does this:

Connection := TZConnection.Create(nil);
Query := TZQuery.Create(nil);
Query.Connection := Connection;
...
Connection.free; // First free
Query.free // Second free

In the case of try .. except the error will be hidden, which may work without consequences, or may lead to an app crash randomly

[NickNevzorov]

Hi

Looking this please. I have found another bug ( NickNevzorov#5 ), but cannot create a pull request while this opened