Fixed [22355] Power of provision information has wrong boost

[Dony]

Game version: v1.57-(99f8dec32)-(master) (2018-06-18 12:12)
HTML5: yes
Game world: zz1
Browser + version: chrome
Operating System: Windows 10
Screen resolution: 1920x1080
Account name: Dony
Humans or Elves: Elf

Reproducibility: 5/5 (1/5 = happened once; 2/5 = happens randomly; 3/5 = happens sometimes; 4/5 = happens often, but not always; 5/5 = happens always)

Quest title: none

Current situation:
Power of provision information has wrong boost (it says +NaN% )

Expected situation:
Proper percentile

Repro steps:
1. Observe PoP information window

 

[Kersepitje]

its looking fine for me (200%) what level prosperity tower do you have?

 

[Dony]

in the image it says +NaN%

 

[Kersepitje]

well not for me

 

[Dony]

i have lvl6 prosperity tower

 

[Kersepitje]

confirmed with a lvl 25 tower of presperity, probably with lower level ones also