fixed PY-7091 Specify type intentions are not available when cursor is at the very beginning of the reference with undefined type

python/testData/intentions/afterTypeAssertion2.py

@@ -0,0 +1,3 @@
+def foo(a, b):
+    assert isinstance(a, object)
+    a.

python/testData/intentions/beforeTypeAssertion2.py

@@ -0,0 +1 @@
+def foo(a, b): <caret>a.