package bogush;

import java.io.*;
import java.nio.file.Path;

class LineCounter {
    static int count(Path file) throws IOException {
        try (InputStream is = new BufferedInputStream(new FileInputStream(file.toFile()))) {
            boolean empty = true;
            byte bytes[] = new byte[1024];
            int readChars;
            int count = 0;
            while ((readChars = is.read(bytes)) != -1) {
                empty = false;
                for (int i = 0; i < readChars; ++i) {
                    if (bytes[i] == '\n') {
                        ++count;
                    }
                }
            }
            return (count == 0 && !empty) ? 1 : count;
        }
    }
}

@@ -350,17 +350,17 @@
 count = 
-0
+1
 ;%0A      
@@ -642,50 +642,111 @@
     
-return (count == 0 && !empty) ? 1 : count;
+if (empty) %7B%0A                return 0;%0A            %7D else %7B%0A                return count;%0A            %7D
 %0A   

Fix to count 0 on empty files and (amount of line-breaks + 1) on non-empty files