add try catch for missing package in old boto versions

tests/test_dynamodb2/test_dynamodb.py

@@ -1,12 +1,14 @@
 import boto
 import sure  # noqa
 import requests
-import boto.dynamodb2
 from moto import mock_dynamodb2
 from moto.dynamodb2 import dynamodb_backend2
 from boto.exception import JSONResponseError
 from tests.helpers import requires_boto_gte
-
+try:
+    import boto.dynamodb2
+except ImportError:
+    print "This boto version is not supported"
 
 @requires_boto_gte("2.9")
 @mock_dynamodb2

tests/test_dynamodb2/test_dynamodb_table_with_range_key.py

@@ -2,6 +2,9 @@ import boto
 import sure  # noqa
 from freezegun import freeze_time
 from moto import mock_dynamodb2
+from boto.exception import JSONResponseError
+from tests.helpers import requires_boto_gte
+try:
     from boto.dynamodb2.fields import HashKey
     from boto.dynamodb2.fields import RangeKey
     from boto.dynamodb2.table import Table
@@ -9,8 +12,8 @@ from boto.dynamodb2.table import Item
     from boto.dynamodb.exceptions import DynamoDBKeyNotFoundError
     from boto.dynamodb2.exceptions import ValidationException
     from boto.dynamodb2.exceptions import ConditionalCheckFailedException
-from boto.exception import JSONResponseError
-from tests.helpers import requires_boto_gte
+except ImportError:
+    print "This boto version is not supported"
     
 def create_table():
     table = Table.create('messages', schema=[

tests/test_dynamodb2/test_dynamodb_table_without_range_key.py

@@ -3,11 +3,14 @@ import sure  # noqa
 from freezegun import freeze_time
 from boto.exception import JSONResponseError
 from moto import mock_dynamodb2
+from tests.helpers import requires_boto_gte
+try:
     from boto.dynamodb2.fields import HashKey
     from boto.dynamodb2.fields import RangeKey
     from boto.dynamodb2.table import Table
     from boto.dynamodb2.table import Item
-from tests.helpers import requires_boto_gte
+except ImportError:
+    print "This boto version is not supported"
     
 def create_table():
     table = Table.create('messages', schema=[