build: rework checks in i18n-scan.pl

diff --git a/build/i18n-scan.pl b/build/i18n-scan.pl
index 1243545..781ac64 100755 (executable)
--- a/build/i18n-scan.pl
+++ b/build/i18n-scan.pl
@@ -60,7 +60,7 @@ if( open F, "find @ARGV -type f '(' -name '*.htm' -o -name '*.lua' ')' |" )
 
                                if( $code =~ /^['"]/ )
                                {
-                                       while( defined $sub && length($sub) > 0 )
+                                       while( defined $sub )
                                        {
                                                ( $sub, $code ) = extract_delimited($code, q{'"}, q{\s*(?:\.\.\s*)?});
 
@@ -68,6 +68,10 @@ if( open F, "find @ARGV -type f '(' -name '*.htm' -o -name '*.lua' ')' |" )
                                                {
                                                        $res .= substr $sub, 1, length($sub) - 2;
                                                }
+                                               else
+                                               {
+                                                       undef $sub;
+                                               }
                                        }
                                }
                                elsif( $code =~ /^(\[=*\[)/ )