Handle cases when 0 appropriate signals found

[bekbeis]

Currently, there is no user flow for cases when the tool does not find any signals to fuzz.

LLMCommunicator is initialized with 1 modules to process.

Starting module analysis...

Analyzing module: /Users/bepc/workspace/maveric/cva6/core/cache_subsystem/std_cache_subsystem.sv
Successfully analyzed /Users/bepc/workspace/maveric/cva6/core/cache_subsystem/std_cache_subsystem.sv: found 0 signals.
Note: Most signals in target list are module ports which were excluded from analysis per requirements

Analysis complete. Processed 1 modules.

Now, select the signals you would like to fuzz.

Press Enter to proceed.

Search:
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Commands: Enter/space key to select the signal | Ctrl+c to exit | Ctrl+n to pass signal info further

Possible options:

1. Stop the tool completely.
2. Return to the design explorer module.