mig-sql: silence warning if no $BIBSTART

diff --git a/mig-bin/mig-sql b/mig-bin/mig-sql
index 5b79e17..c218076 100755 (executable)
--- a/mig-bin/mig-sql
+++ b/mig-bin/mig-sql
@@ -33,12 +33,15 @@ use Mig;
 
 pod2usage(-verbose => 2) if defined $ARGV[0] && $ARGV[0] eq '--help';
 
-system(
-    'psql',
-    '-vbibstart=' . $BIBSTART,
-    # TODO inject mig-tracked variables here
-    @ARGV
+my @MYARGV = (
+    'psql'
 );
+if (defined $BIBSTART) {
+    push @MYARGV, '-vbibstart=' . $BIBSTART;
+}
+# TODO inject more mig-tracked variables here
+
+system(@MYARGV, @ARGV);
 
 exit 0;