Guard against attribute error

Summary:
Sometime third-party packages can be imported but there is no desired attribute, for example:

```
    from .operator import Operator
    _ = tk.bf16_b200_gemm
        ^^^^^^^^^^^^^^^^^
AttributeError: module 'thunderkittens' has no attribute 'bf16_b200_gemm'
```

Handle attribute error in `try_import`

Differential Revision: D102627731

Author: xuzhao9

tritonbench/utils/python_utils.py

@@ -9,5 +9,5 @@ def try_import(cond_name: str):
     try:
         yield
         _caller_globals[cond_name] = True
-    except (ImportError, ModuleNotFoundError, OSError) as e:
+    except (ImportError, ModuleNotFoundError, OSError, AttributeError) as e:
         _caller_globals[cond_name] = False