Django : Django runserver error: unsupported operand type(s) for +=: 'NoneType' and 'str'

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Django : Django runserver error: unsupported operand type(s) for +=: 'NoneType' and 'str'
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unsupported Django +=: Django for : 'NoneType' 'str' operand type(s) error: runserver and



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