Add handling for bad quarter name.

cogs/commands/view.py

@@ -5,7 +5,6 @@ Commands for viewing information in the database.
 import nextcord
 import pandas as pd
 from nextcord.ext import commands
-from numpy import indices
 from sqlalchemy import select
 from sqlalchemy.orm import Session
 
@@ -59,8 +58,13 @@ class ViewCog(commands.Cog, name="View Commands"):
                     con=engine,
                 )
 
-            cycles = df.groupby("Cycle")
+            if df.empty:
+                await interaction.followup.send(
+                    f'Quarter "{quarter_name}" is invalid.', ephemeral=True
+                )
+                return
 
+            cycles = df.groupby("Cycle")
             content = ""
             for cycle in cycles.groups:
                 content += f"```{cycle}```\n"