fix(trycmd): Error, instead of ignore, unknown bins

This was originally written this way to be a low effort way to ignore,
especially if you wanted a markdown block of code that interspersed
different commands.

In the general case, though, you can ignore the block and this makes it
harder to root cause problems.

Fixes assert-rs#105

src/runner.rs

@@ -321,20 +321,6 @@ impl Case {
             return Ok(output);
         }
 
-        #[allow(unused_variables)]
-        match &step.bin {
-            Some(crate::schema::Bin::Path(_)) => {}
-            Some(crate::schema::Bin::Name(name)) => {
-                // Unhandled by resolve
-                snapbox::debug!("bin={:?} not found", name);
-                assert_eq!(output.spawn.status, SpawnStatus::Skipped);
-                return Ok(output);
-            }
-            Some(crate::schema::Bin::Error(_)) => {}
-            // Unlike `Name`, this always represents a bug
-            None => {}
-        }
-
         let cmd = step.to_command(cwd).map_err(|e| output.clone().error(e))?;
         let cmd_output = cmd
             .output()