BugFix: EditAppointmentCommand validate appointment

[codecov[bot]]

Codecov Report

Merging #151 (ccc3328) into master (f5feb84) will decrease coverage by 0.04%. The diff coverage is 81.48%.

@@             Coverage Diff              @@
##             master     #151      +/-   ##
============================================
- Coverage     82.38%   82.35%   -0.04%     
- Complexity      734      740       +6     
============================================
  Files           105      105              
  Lines          2135     2148      +13     
  Branches        214      214              
============================================
+ Hits           1759     1769      +10     
- Misses          344      347       +3     
  Partials         32       32              

Files	Coverage Δ
.../address/logic/commands/AddAppointmentCommand.java	100.00% <ø> (ø)
...address/logic/commands/EditAppointmentCommand.java	97.40% <ø> (ø)
...ress/logic/parser/AddAppointmentCommandParser.java	100.00% <ø> (ø)
.../seedu/address/logic/parser/MediConnectParser.java	100.00% <ø> (ø)
src/main/java/seedu/address/model/Database.java	98.76% <100.00%> (+0.28%)	:arrow_up:
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	95.87% <ø> (ø)
...a/seedu/address/model/appointment/Appointment.java	100.00% <100.00%> (ø)
.../java/seedu/address/model/util/SampleDataUtil.java	0.00% <ø> (ø)
.../seedu/address/storage/JsonAdaptedAppointment.java	100.00% <ø> (ø)
... and 4 more

... and 1 file with indirect coverage changes

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