Don't print TruffleObjects on AttributeError

This avoids that internal implementation details leak when an `AttributeError` is raised on TruffleObjects.

Author: fniephaus

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/foreign/ForeignObjectBuiltins.java

@@ -649,7 +649,7 @@ protected Object doIt(Object object, Object key,
                 }
             } catch (UnknownIdentifierException | UnsupportedMessageException ignore) {
             }
-            throw raise(PythonErrorType.AttributeError, "foreign object %s has no attribute %s", object, key);
+            throw raise(PythonErrorType.AttributeError, "foreign object has no attribute %s", key);
         }
     }
 
@@ -662,7 +662,7 @@ protected PNone doIt(Object object, String key, Object value,
             try {
                 lib.writeMember(object, key, value);
             } catch (UnknownIdentifierException | UnsupportedMessageException | UnsupportedTypeException e) {
-                throw raise(PythonErrorType.AttributeError, "foreign object %s has no attribute %s", object, key);
+                throw raise(PythonErrorType.AttributeError, "foreign object has no attribute %s", key);
             }
             return PNone.NONE;
         }
@@ -689,7 +689,7 @@ protected PNone doIt(Object object, String key,
             try {
                 lib.removeMember(object, key);
             } catch (UnknownIdentifierException | UnsupportedMessageException e) {
-                throw raise(PythonErrorType.AttributeError, "foreign object %s has no attribute %s", object, key);
+                throw raise(PythonErrorType.AttributeError, "foreign object has no attribute %s", key);
             }
             return PNone.NONE;
         }