'Rated by 1 user' hover text displayed for extensions with no ratings

[mjbvz]

Issue Type: Bug

Testing #66450

Repo

1. Search extension marketplace for an extension with no ratings
2. Open that extension's detail page
3. Hover over stars in the extension header bar

Bug
The text Rated by 1 user is displayed. It should actually be zero

VS Code version: Code - Insiders 1.31.0-insider (7f136b4, 2019-01-31T06:13:53.077Z)
OS version: Darwin x64 18.2.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz (8 x 2200)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled surface_synchronization: enabled_on video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	2, 4, 5
Memory (System)	16.00GB (0.04GB free)
Process Argv	-psn_0_22394202
Screen Reader	no
VM	20%