v1.4 minor adjustment according to feedback from PE-Dry run

[lincolnkoh99]

No description provided.

[codecov-io]

Codecov Report

Merging #171 into master will increase coverage by 0.15%.
The diff coverage is 44.11%.

@@             Coverage Diff              @@
##             master     #171      +/-   ##
============================================
+ Coverage     56.75%   56.90%   +0.15%     
  Complexity      680      680              
============================================
  Files           122      122              
  Lines          2747     2745       -2     
  Branches        316      316              
============================================
+ Hits           1559     1562       +3     
+ Misses         1063     1056       -7     
- Partials        125      127       +2     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/seedu/address/MainApp.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...in/java/seedu/address/commons/util/StringUtil.java	94.73% <ø> (+19.73%)	7.00 <0.00> (ø)
...eedu/address/logic/commands/AddContactCommand.java	100.00% <ø> (ø)	8.00 <0.00> (ø)
...eedu/address/logic/commands/AddMeetingCommand.java	80.00% <0.00%> (ø)	9.00 <0.00> (ø)
.../address/logic/commands/AddParticipantCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...du/address/logic/commands/ClearContactCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...du/address/logic/commands/ClearMeetingCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...u/address/logic/commands/DeleteContactCommand.java	100.00% <ø> (ø)	7.00 <0.00> (ø)
...u/address/logic/commands/DeleteMeetingCommand.java	85.00% <ø> (ø)	9.00 <0.00> (ø)
...dress/logic/commands/DeleteParticipantCommand.java	75.00% <ø> (ø)	7.00 <0.00> (ø)
... and 20 more

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[AdithyaNarayan]

LGTM! Good job on fixing bugs mentioned in PE Dry Run. I see that you have fixed bugs that you have discovered yourself too! Thanks for taking the initiative