Accessibility - Graphs missing alt text

[maur1]

Current Behavior

Graphs missing alt text or blank alt text if they can’t be described

Proposed Behavior

Add alt text to graphs that can be described and blank if not

Checklist

• I have read and understand the contributing guidelines
• I have checked the existing issues for whether this enhancement was already requested

[nscuro]

Just want to say thanks so much for reporting all these accessibility issues @maur1! We really appreciate folks with expertise looking at this.