TEST: Add test for struct with no init_expr

Author: ubaidsk

tests/errors/structs_02.py

@@ -0,0 +1,11 @@
+from lpython import i32, dataclass
+
+@dataclass
+class S:
+    x: i32
+
+def main0():
+    s: S
+    s.x = 2
+
+main0()

tests/tests.toml

@@ -638,6 +638,10 @@ asr = true
 filename = "errors/structs_01.py"
 asr = true
 
+[[test]]
+filename = "errors/structs_02.py"
+asr = true
+
 [[test]]
 filename = "errors/const_01.py"
 asr = true