Avoid 100% CPU hang when process table has empty columns for some processes (observed on AIX). This code would benefit from some refactoring (create new struct for process information).

(cherry picked from commit ee9375f925aaac9f41aea659133b1a651d4c5aeb)
Merge pull request #1656 from awsiv/3.3.x

Avoid 100% CPU hang when process table has empty columns for some processes