Rebuilt bl.jdk7 to expose recently added priority rule
MPS-19505 (java.lang.IllegalArgumentException): Argument for @NotNull parameter 'node' of org/jetbrains/mps/openapi/model/SNodeUtil.getDebugText must not be null.   It's legal to have an entry in currentToOriginalMap with null value - e.g. new nodes created by scripts get registered in the map with null value for original node.