BUG: bug in chained assignment with ix and another chained series (GH5928)
Merge pull request #5930 from jreback/indexer

BUG: bug in chained assignment with ix and another chained series (GH5928)
BUG: Bug in creating an empty DataFrame, copying, then assigning (GH5932)
Merge pull request #5935 from jreback/empty_frame_copy

BUG: Bug in creating an empty DataFrame, copying, then assigning (GH5932)
Fix bug 5846