Only remove double angle quotes if some of both

[GlazerMann]

Fixes websites the do sections using these instead of arrow:
Science » Chemistry » Physical Chemistry » Computational Chemistry » Super Heroes

[codecov]

Codecov Report

Merging #708 into master will decrease coverage by 1.52%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #708      +/-   ##
============================================
- Coverage     68.61%   67.09%   -1.53%     
- Complexity     1609     1622      +13     
============================================
  Files            12       12              
  Lines          3202     3221      +19     
============================================
- Hits           2197     2161      -36     
- Misses         1005     1060      +55

Impacted Files	Coverage Δ	Complexity Δ
DOItools.php	93.75% <100%> (+0.2%)	0 <0> (ø)	⬇️
Template.php	73.08% <0%> (-2.53%)	1451% <0%> (+13%)
expandFns.php	90.71% <0%> (+0.71%)	0% <0%> (ø)	⬇️

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[ms609]

Can we add a suitable test please?