Add block dialog fails when adding manual strategy function

[murderteeth]

When I use the dialog's Manual mode I can use a vault address, choose a function, and successfully create a new block. But if I use a strategy address, I get an error in the console and the block is not created.

TypeError: Cannot read properties of null (reading 'address')

To reproduce:

• Sandbox
• Add block
• Manual
• Enter a strategy address (eg, 0x0A5157244e4F82F100A461CA65C7b05C8dACf835)
• Chose any function
• Click Add block

[murderteeth]

resolved by https://github.com/yearn/dashboard_ui/pull/52