Return the number of results yet to be generated for the pending sleigh job, .Object.
Usage
## S3 method for class 'sleighPending':
checkSleigh(.Object)
Arguments
.Object
a sleighPending class object
Details
The sleighPending class object, .Object, is usually obtained through non-blocking
eachElem or non-blocking eachWorker. If the pending job is finished, i.e.
all results are generated, then 0 is returned.