GitHub user mohammadshahidkhan opened a pull request:

    [CARBONDATA-317] - CSV having only space char is throwing NullPointer…

    Problem: Data loading fails if csv is having only empty chars
    Analysis: During data load, in global dictionary generation step while 
reading the first line for the headers 
    its getting null value from the LineCsvReader.
    Solution : Added null check over first row and throwing exception asking to 
provide valid csv.
    "Please check your input path and make sure csv file contains valid header."
    Impact area: Data load with csv having only space char in first line.

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with (at least) the following in the commit message:

    This closes #237


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