Correctly handle Vec with zero capacity in from_vec
#332
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When the capacity of the vec it zero, there might not have been any memory allocated for it, thus the pointer obtained by `as_mut_ptr` may dangle.
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Since the standard library does not allocate any memory for vectors with capacity 0, the pointer returned by
as_mut_ptris dangling in that case. This causes a segfault, whenshrink_to_fittries to free.