Python STL container method overloading fix

Fix method overloading of methods that take STL containers of different types.
Due to some error handling that was not cleared during typehecking.

Examples/test-suite/python/li_std_containers_overload_runme.py

@@ -0,0 +1,29 @@
+from li_std_containers_overload import *
+
+def check(got, expected):
+    if got != expected:
+        raise RuntimeError("Failed check. '{}' != '{}'".format(got, expected))
+
+v = VectorX()
+check(VectorOverload(v), "vector<X>")
+
+v = VectorY()
+check(VectorOverload(v), "vector<Y>")
+
+v = VectorInt()
+check(VectorOverload(v), "vector<int>")
+
+v = VectorString()
+check(VectorOverload(v), "vector<string>")
+
+v = [X()]
+check(VectorOverload(v), "vector<X>")
+
+v = [Y()]
+check(VectorOverload(v), "vector<Y>")
+
+v = [1, 2, 3]
+check(VectorOverload(v), "vector<int>")
+
+v = ["aaa", "bbb", "ccc"]
+check(VectorOverload(v), "vector<string>")