PY-12981 django apps don't resolve when INSTALLED_APPS is set with '+='

python/testData/blockEvaluator/external_module.py

@@ -0,0 +1,4 @@
+SOME_VARIABLE = "42"
+SOME_LIST = ['a', 'b']
+
+

python/testData/blockEvaluator/my_module.py

@@ -0,0 +1,9 @@
+__author__ = 'Ilya.Kazakevich'
+from external_module import SOME_VARIABLE, SOME_LIST
+from some_package import VARIABLE_IN_PACKAGE
+from some_package.module_in_package import *
+from some_package.another_module_in_package import VARIABLE_IN_PACKAGE_MODULE_2 as MY_RENAMED_VAR
+
+
+SOME_LIST += ['c', 'd']
+

python/testData/blockEvaluator/some_package/__init__.py

@@ -0,0 +1,2 @@
+__author__ = 'Ilya.Kazakevich'
+VARIABLE_IN_PACKAGE = "foo"

python/testData/blockEvaluator/some_package/another_module_in_package.py

@@ -0,0 +1,2 @@
+__author__ = 'Ilya.Kazakevich'
+VARIABLE_IN_PACKAGE_MODULE_2 = "foo"

python/testData/blockEvaluator/some_package/module_in_package.py

@@ -0,0 +1,2 @@
+__author__ = 'Ilya.Kazakevich'
+VARIABLE_IN_PACKAGE_MODULE = "foo"