MYNEWT-655 newt - Detect newt version incompat.

Correctly handle case where project imposes no newt version
restrictions.


Project: http://git-wip-us.apache.org/repos/asf/incubator-mynewt-newt/repo
Commit: 
http://git-wip-us.apache.org/repos/asf/incubator-mynewt-newt/commit/cd6aa05a
Tree: http://git-wip-us.apache.org/repos/asf/incubator-mynewt-newt/tree/cd6aa05a
Diff: http://git-wip-us.apache.org/repos/asf/incubator-mynewt-newt/diff/cd6aa05a

Branch: refs/heads/master
Commit: cd6aa05ad717f1cf1b3e13c04cb46795c8123e20
Parents: b1ecb9f
Author: Christopher Collins <ccoll...@apache.org>
Authored: Tue Mar 7 14:03:48 2017 -0800
Committer: Christopher Collins <ccoll...@apache.org>
Committed: Tue Mar 7 14:03:48 2017 -0800

----------------------------------------------------------------------
 newt/project/project.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-mynewt-newt/blob/cd6aa05a/newt/project/project.go
----------------------------------------------------------------------
diff --git a/newt/project/project.go b/newt/project/project.go
index 6778c8b..42015bb 100644
--- a/newt/project/project.go
+++ b/newt/project/project.go
@@ -443,7 +443,7 @@ func (proj *Project) checkNewtVer() error {
        compatSms := proj.v.GetStringMapString("project.newt_compatibility")
        // If this project doesn't have a newt compatibility map, just assume 
there
        // is no incompatibility.
-       if compatSms == nil {
+       if len(compatSms) == 0 {
                return nil
        }
 

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