Take Copilot suggestion.

Make it look like the `Python2Interpreter`.

Author: khatchad

com.ibm.wala.cast.python.jython3/source/com/ibm/wala/cast/python/util/Python3Interpreter.java

@@ -1,5 +1,6 @@
 package com.ibm.wala.cast.python.util;
 
+import org.python.core.PyException;
 import org.python.core.PyObject;
 import org.python.core.PySystemState;
 import org.python.util.PythonInterpreter;
@@ -17,11 +18,15 @@ public static PythonInterpreter getInterp() {
   }
 
   public Integer evalAsInteger(String expr) {
-    PyObject val = getInterp().eval(expr);
-    if (val.isInteger()) {
-      return val.asInt();
-    } else {
-      return null;
+    try {
+      PyObject val = getInterp().eval(expr);
+      if (val.isInteger()) {
+        return val.asInt();
+      }
+    } catch (PyException e) {
+
     }
+
+    return null;
   }
 }