Don't ignore MySQL errors on initialization.

Otherwise, we fail to notice, for example, when the database server isn't
5.6.4 or higher. Resolves #158.

Changes

@@ -13,9 +13,12 @@ Revision history for Perl extension App::Sqitch
        database. Thanks to Timothy Procter for the report (Issue #166).
      - Fixed issue with aggregating text values with `COLLECT()` on Oracle.
        Thanks to Timothy Procter for the spelunking (Issue #91).
-     - Fix issue where SQL*Plus could not run rework scripts because of the
+     - Fixed issue where SQL*Plus could not run rework scripts because of the
        `@` in the file name. Thanks to Timothy Procter for the report
        (Issue #165).
+     - Fix issue where, on first deploy, the MySQL engine would fail to notice
+       that the server was not the right version of MySQL. Thanks to Luke
+       Young for the report (Issue #158).
 
 0.992  2014-03-05T00:34:49Z
      - Fixed target test failures on Windows.

lib/App/Sqitch/Engine/mysql.pm

@@ -171,12 +171,13 @@ sub initialized {
     my $self = shift;
 
     # Try to connect.
-    my $err = 0;
-    my $dbh = try { $self->dbh } catch { $err = $DBI::err };
-    # MySQL error code 1049 (ER_BAD_DB_ERROR): Unknown database '%-.192s'
-    return 0 if $err && $err == 1049;
+    my $dbh = try { $self->dbh } catch {
+        # MySQL error code 1049 (ER_BAD_DB_ERROR): Unknown database '%-.192s'
+        return if $DBI::err && $DBI::err == 1049;
+        die $_;
+    } or return 0;
 
-    return $self->dbh->selectcol_arrayref(q{
+    return $dbh->selectcol_arrayref(q{
         SELECT COUNT(*)
           FROM information_schema.tables
          WHERE table_schema = ?