fix(rules): prevent appending empty command parts in forEachPipePart and remove redundant calculation in parseDoWithBlocks function

internal/route/rules/do_blocks.go

@@ -417,10 +417,6 @@ func parseDoWithBlocks(src string) (handlers []CommandHandler, err error) {
 			}
 
 			// Not a nested block; parse the rest of this line as a command.
-			lineEnd = pos
-			for lineEnd < length && src[lineEnd] != '\n' {
-				lineEnd++
-			}
 			if lerr := appendLineCommand(src[pos:lineEnd]); lerr != nil {
 				return nil, lerr
 			}

internal/route/rules/on.go

@@ -651,7 +651,9 @@ func forEachPipePart(s string, fn func(part string)) {
 			}
 		case '|':
 			if quote == 0 && brackets == 0 {
-				fn(strings.TrimSpace(s[start:i]))
+				if part := strings.TrimSpace(s[start:i]); part != "" {
+					fn(part)
+				}
 				start = i + 1
 			}
 		}