Hedging against repositories without src or repo

src/spm/spm.moon

@@ -76,7 +76,12 @@ getRepositories = (repoLocation) ->
     			repositories[linkedRepositoryName] = linkedRepository
     		continue
 
-    	src = repository.src or nil
+    	if repository.src == nil and repository.repo == nil
+    		print("Repository malformed/unsupported:" .. repositoryName)
+    		continue
+
+    	src = repository.src
+
     	if src == nil
     		src = githubContentRoot .. repository.repo .."/master"
     	repositories[repositoryName] = Repository(repositoryName, src)