Add integration test for editpatientcommand and allocateroomcommand

[LeeMingDe]

Fix the optional bug for editpatient as well

[codecov-io]

Codecov Report

Merging #244 (ddf1d1c) into master (c46b747) will increase coverage by 0.11%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master     #244      +/-   ##
============================================
+ Coverage     68.82%   68.94%   +0.11%     
  Complexity      837      837              
============================================
  Files           120      120              
  Lines          2759     2760       +1     
  Branches        350      350              
============================================
+ Hits           1899     1903       +4     
+ Misses          707      705       -2     
+ Partials        153      152       -1     

Impacted Files	Coverage Δ	Complexity Δ
...dress/logic/commands/room/AllocateRoomCommand.java	70.76% <0.00%> (ø)	11.00 <0.00> (ø)
...logic/parser/patient/EditPatientCommandParser.java	93.10% <ø> (ø)	9.00 <0.00> (ø)
...s/logic/parser/room/AllocateRoomCommandParser.java	90.47% <ø> (+14.28%)	5.00 <0.00> (+1.00)
src/main/java/seedu/address/model/room/Room.java	90.00% <100.00%> (+0.12%)	28.00 <1.00> (-1.00)	⬆️

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[w-yeehong]

Apart from a few nits, LGTM! Awesome work with adding more test cases. 👍