Remove Errors For .nodes

[esarver]

When calling .nodes <file> there were a few unnecessary error cases:

1. If there were no TSP-Link nodes to initialize, an error would be added to the errorqueue
   • This was fixed by using tsplink.reset(1) and tsplink.initialize(0) instead of the no-parameter overloads
2. If the given file didn't exist, an error was thrown even though we can create it.
   • This was fixed by removing the check for file existence.

This PR also includes an incidental fix for a clippy warning. We were calling enumerate unnecessarily.

[github-actions]

Package	Line Rate	Health
kic-discover/src/lib.rs	0%	❌
kic/src/main.rs	0%	❌
kic-discover/src/instrument_discovery/mod.rs	0%	❌
instrument-repl/src/resources/mod.rs	100%	✔
instrument-repl/src/instrument.rs	86%	✔
kic-discover/src/usbtmc/mod.rs	0%	❌
kic-discover/src/ethernet/mod.rs	0%	❌
instrument-repl/src/state_machine.rs	63%	✔
kic/src/process.rs	0%	❌
instrument-repl/src/tsp_error.rs	0%	❌
instrument-repl/src/error.rs	0%	❌
kic-discover/src/main.rs	0%	❌
instrument-repl/src/repl.rs	0%	❌
kic/src/error.rs	0%	❌
Summary	17% (295 / 1783)	❌