Some chords don't appear correctly

[andrelopespereira]

Describe the bug
In some unusual chords, it shows a "empty" figure.

To Reproduce
Steps to reproduce the behavior:

1. Go to a music
2. Click on the chord
3. See a "empty" figure

Expected behavior
The correct chord is shown on the figure.

Smartphone (please complete the following information):

• Device: Samsung S10e
• OS: Android 10
• App Version: 0.3.1

Screenshots

[artutra]

Could you write here the chorpro text that is causing this?

[andrelopespereira]

But th[C]is is not all[G]owed
You're uninv[D]ited
{comment:  [Dº] [D] (baixo com primeira nota da tríade)}
An unfortunate slight

The chord would be:

[artutra]

I guess I found the bug. That is 2 ways to write this circle character:
° and º
I will automatically convert one to another by code on the next version.
Thanks!

[andrelopespereira]

There's others notations to look. For example:

Em7/5- seems to be missing on the chord set
Bdim shows a blank tab too

[andrelopespereira]

ChordPro text:

Moça bon[Em7/5-]ita, seu [A7]olho br[Dm]ilha
(...)
Ou é só br[Bdim]ilho femin[C]ino

[artutra]

In this case the chord Bdim is actually missing, but it is strange with Em7/5-, I can find it on the database