Add option to keep empty environment variable keys in normalization #634
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In #589, the normalisation logic strips off any environment variables that does not have a value in config, however, i my use case, I am still interested in any empty environment variables names that has been set, which i'll resolve the value at a later stage, so I am implementing an naive option to allow me keep them during normalisation, please let me know if there is a better way of doing it. Currently, I have to load the project twice, use the one without normalisation to detect those empty environment variables.