Unnecessary initialization of struct pointers fix #201
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Here is the correct version of the removeEmptyStructs mentioned in #113 that support multiple levels of structs nesting when some levels can be pointers and some not:
https://github.com/hexdigest/envconfig/blob/master/envconfig.go#L230:L263
I also added tests for this func.
Hope it helps to everyone who struggle from the same issue.
@kelseyhightower not quite sure that point_up thing can be a good candidate for a PR because it's more of a cleanup rather than an actual fix for the env parser even though I don't see how it can break something.