Test IsPushOnly() with invalid push
Merge pull request #4561

d0867ac Use const CCoinsView's at some places. (Daniel Kraft)
a3dc587 Make appropriate getter-routines "const" in CCoinsView. (Daniel Kraft)
ffb4c21 Mark LevelDB "Read" and "Exists" functions as const. (Daniel Kraft)
Merge pull request #4763

aa41ac2 Test IsPushOnly() with invalid push (Peter Todd)