Fixed: No history returned if save=false

[Rbthn]

If the keyword-argument save=false is passed to an Estimator at construction time, the estimator will not save the results to disk when it is run. In this case, however, the function also doesn't return the results. This PR fixes this behavior, s.t. the results are returned.

[coveralls]

Pull Request Test Coverage Report for Build 10184073975

Details

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 94.759%

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Totals
Change from base Build 9511266155:	0.0%
Covered Lines:	886
Relevant Lines:	935

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💛 - Coveralls

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.75%. Comparing base (3eeb093) to head (c6aea89).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6 +/- ## ======================================= Coverage 94.75% 94.75% ======================================= Files 16 16 Lines 935 935 ======================================= Hits 886 886 Misses 49 49 ```

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