"Sadly, no tokens yet" after importing wallet with non-zero balance - Follow up to 2260

[LaurenWags]

Description

Follow up issue to #2260

After importing a funded Brave Payments wallet into Brave Rewards, the Rewards Settings page shows the correct non-zero balance for the wallet, but continues to show the "Sadly, no tokens yet" sidebar. This is confusing because it contradicts the existence of the tokens from the imported wallet, which are reflected in the displayed non-zero wallet balance.

Test plan / Steps to Reproduce

1. Import Muon/Brave Payments wallet into b-c/Brave Rewards (detailed test plan in Import Brave Payments data from Muon brave-core#736).
2. Click Brave Rewards icon in address bar, then Rewards Settings in the dropdown.

Actual result:

Expected result:

If the wallet balance is zero, the sidebar should not say "no tokens yet."

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	0.57.17 Chromium: 71.0.3578.80 (Official Build) (64-bit)
Revision	2ac50e7249fbd55e6f517a28131605c9fb9fe897-refs/branch-heads/3578@{#860}
OS	Mac OS X

Reproducible on current release:

• Does it reproduce on brave-browser dev/beta builds?
  Yes

[LaurenWags]

cc @rebron as original issue was slated for 0.57.x

[NejcZdovc]

should be fixed with brave/brave-core#1075

[LaurenWags]

Verified passed with

Brave	0.58.14 Chromium: 71.0.3578.98 (Official Build) (64-bit)
Revision	15234034d19b85dcd9a03b164ae89d04145d8368-refs/branch-heads/3578@{#897}
OS	Mac OS X

• Verified STR from description and test plan in Fixes import summary problem brave-core#1075
  

Verification passed on

Brave	0.58.14 Chromium: 71.0.3578.98 (Official Build) (64-bit)
Revision	15234034d19b85dcd9a03b164ae89d04145d8368-refs/branch-heads/3578@{#897}
OS	Windows 7

• Used STR from OP and test plan from Fixes import summary problem brave-core#1075

Verification PASSED on Ubuntu 18.04.1 x64 using the following build:

Brave	0.58.14 Chromium: 71.0.3578.98 (Official Build) (64-bit)
Revision	15234034d19b85dcd9a03b164ae89d04145d8368-refs/branch-heads/3578@{#897}
OS	Linux