[DBIx-Class-Devel] [dbsrgits/sql-abstract] Do not generate incorrect SQL in presence of -and=>[] (#15)

[fabzzap]

An empty array ref as value for `-and` can cause incorrect SQL. Example:

```
$ perl -Mv5.12 -MSQL::Abstract -e 'my ($sql, at bind)=SQL::Abstract->new->where({-and=>[],-or=>[a=>1]});say $sql'
Use of uninitialized value in join or string at /usr/share/perl5/SQL/Abstract.pm line 1482.
 WHERE ( (  AND a = ? ) )
```
This is a proposed fix to that bug
You can view, comment on, or merge this pull request online at:

  https://github.com/dbsrgits/sql-abstract/pull/15

-- Commit Summary --

  * Do not generate incorrect SQL in presence of -and=>[]

-- File Changes --

    M lib/SQL/Abstract.pm (9)

-- Patch Links --

https://github.com/dbsrgits/sql-abstract/pull/15.patch
https://github.com/dbsrgits/sql-abstract/pull/15.diff

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