Fix #613

[kellertuer]

This resolves #613

The problem was that if is_point returned true and te was false, the is_vector already returned true without checking the vector.

Now it correctly

1. Throws an error if the point check fails and te=true (not done before)
2. returns false if the point check fails and te=false
3. continues to checking the vector (as opposed to before) if the point check passes.

[codecov]

Codecov Report

Merging #614 (4601558) into master (b515345) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #614      +/-   ##
==========================================
- Coverage   99.00%   98.98%   -0.03%     
==========================================
  Files         104      104              
  Lines       10034    10033       -1     
==========================================
- Hits         9934     9931       -3     
- Misses        100      102       +2     

Impacted Files	Coverage Δ
src/groups/group.jl	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[mateuszbaran]

LGTM!