fix(py): remove silent exception handlers in topology_optimization (CodeQL/CodeFactor)

- Replace three `try/except ...: pass` blocks with existence checks before os.remove.
- No behavioral change; resolves “Unreachable except block” and “Empty except” findings.

Signed-off-by: shbhmexe <shubhushukla586@gmail.com>

Author: shbhmexe

SU2_PY/topology_optimization.py

@@ -120,13 +120,9 @@ def obj_val(self, x):
         # write inputs
         self._write_input(x)
 
-        # clear previous output and run direct solver
-        try:
+        # clear previous output if present and run direct solver
+        if os.path.exists(self._objValFile):
             os.remove(self._objValFile)
-        except Exception:
-            pass
-        except OSError:
-            pass  # Ignore error if file does not exist
 
         try:
             sp.call(self._objValCommand, shell=True)
@@ -149,13 +145,9 @@ def obj_val(self, x):
     def obj_der(self, x):
         # inputs written in obj_val_driver
 
-        # clear previous output and run direct solver
-        try:
+        # clear previous output if present and run direct solver
+        if os.path.exists(self._objDerFile):
             os.remove(self._objDerFile)
-        except Exception:
-            pass
-        except OSError:
-            pass  # Ignore error if file does not exist
         N = x.shape[0]
         y = np.ndarray((N,))
 
@@ -201,14 +193,9 @@ def con_val(self, x):
     def con_der(self, x):
         # inputs written in obj_val_driver
 
-        # clear previous output and run solver
-        try:
+        # clear previous output if present and run solver
+        if os.path.exists(self._conDerFile):
             os.remove(self._conDerFile)
-        except Exception:
-            pass
-
-        except OSError:
-            pass  # Ignore error if file does not exist
         N = x.shape[0]
         y = np.ndarray((N,))