build: rework i18n-scan.pl defined checks

diff --git a/build/i18n-scan.pl b/build/i18n-scan.pl
index 3f73271..1243545 100755 (executable)
--- a/build/i18n-scan.pl
+++ b/build/i18n-scan.pl
@@ -60,15 +60,11 @@ if( open F, "find @ARGV -type f '(' -name '*.htm' -o -name '*.lua' ')' |" )
 
                                if( $code =~ /^['"]/ )
                                {
-                                       while( defined $sub )
+                                       while( defined $sub && length($sub) > 0 )
                                        {
                                                ( $sub, $code ) = extract_delimited($code, q{'"}, q{\s*(?:\.\.\s*)?});
 
-                                               if( length($sub) < 1 ) {
-                                                       undef $sub;
-                                               }
-
-                                               if( defined $sub )
+                                               if( defined $sub && length($sub) > 2 )
                                                {
                                                        $res .= substr $sub, 1, length($sub) - 2;
                                                }