MeTTa Returns Empty for Unevaluated Expression !((+ 1) 1) - Bug?

[TeamSPoon]

When evaluating the expression !((+ 1) 1) in MeTTa-REPL, the output is [] (Empty). However, the expected behavior is to return [ ((+ 1) 1) ], representing the unevaluated expression as per MeTTa's principles.

Steps to Reproduce

1. Open MeTTa-REPL.
2. Enter the following command:

   !((+ 1) 1)
   

3. Observe the output.

Actual Behavior

The REPL returns:

[]

Expected Behavior

The REPL should return:

[((+ 1) 1)]

Additional Notes

This appears to be a bug that happens with

> !((abs-math) -1)
[]

but not with

> !((goofed) -1)
[((goofed) -1)]