WSC007: File begins with newline

Check empty lines before the first non-empty line.

Example

Input file: examples/WSC007_new_line_at_bof.py

class LabelPrinter:
    def print(self, printer: (Printer, None)=None, copies: int=1):
        printer = printer or Printer(config.App.LABEL_PRINTER)

        self.print_to_pdf()
        printer.print_pdf(self.__pdf_path, options={'copies': str(copies)})

Command:

$ wscheck 'examples/WSC007_new_line_at_bof.py'

In examples/WSC007_new_line_at_bof.py line 2:
class LabelPrinter:
^-- WSC007: File begins with newline