Fixes #305 with try catch instead of if

atests/issues/305.robot

@@ -0,0 +1,8 @@
+*** Settings ***
+Library  ../../src/RequestsLibrary/RequestsKeywords.py
+
+
+*** Test Cases ***
+Test NTLM Session without installed library
+    ${auth}=    Create List  1  2  3
+    Run Keyword And Expect Error  requests_ntlm module not installed  Create Ntlm Session  ntlm  http://localhost:80  ${auth}

src/RequestsLibrary/RequestsKeywords.py

@@ -347,9 +347,11 @@ def create_ntlm_session(
                               eg. set to [502, 503] to retry requests if those status are returned.
                               Note that max_retries must be greater than 0.
         """
-        if not HttpNtlmAuth:
-            raise AssertionError('Requests NTLM module not loaded')
-        elif len(auth) != 3:
+        try:
+            HttpNtlmAuth
+        except NameError:
+            raise AssertionError('requests_ntlm module not installed')
+        if len(auth) != 3:
             raise AssertionError('Incorrect number of authentication arguments'
                                  ' - expected 3, got {}'.format(len(auth)))
         else:

src/RequestsLibrary/version.py

@@ -1 +1 @@
-VERSION = '0.7.1'
+VERSION = '0.7.2'