Remove extra blank lines.

def fix_e303(self, result):
        """Remove extra blank lines."""
        delete_linenum = int(result['info'].split('(')[1].split(')')[0]) - 2
        delete_linenum = max(1, delete_linenum)

        # We need to count because pycodestyle reports an offset line number if
        # there are comments.
        cnt = 0
        line = result['line'] - 2
        modified_lines = []
        while cnt < delete_linenum and line >= 0:
            if not self.source[line].strip():
                self.source[line] = ''
                modified_lines.append(1 + line)  # Line indexed at 1
                cnt += 1
            line -= 1

        return modified_lines