Fix application crash when input //// as path

[NereusWB922]

No description provided.

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[codecov]

Codecov Report

Merging #310 (f90c686) into master (84f82f6) will increase coverage by 0.18%.
Report is 30 commits behind head on master.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master     #310      +/-   ##
============================================
+ Coverage     78.31%   78.49%   +0.18%     
- Complexity      937      939       +2     
============================================
  Files           116      116              
  Lines          3011     3055      +44     
  Branches        363      364       +1     
============================================
+ Hits           2358     2398      +40     
- Misses          484      488       +4     
  Partials        169      169              

Files	Coverage Δ
...in/java/seedu/address/model/path/RelativePath.java	88.23% <100.00%> (ø)
src/main/java/seedu/address/model/path/Path.java	90.16% <60.00%> (+0.33%)	⬆️

... and 11 files with indirect coverage changes

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[Nid21cs]

LGTM

[NgChunMan]

LGTM