Can OP27 Trim pins float?
By looking at the functional block diagram: 



And reading page 14 in the datasheet:


  The input offset voltage of the 
  OP27
  is trimmed at wafer level. 
  However, if further adjustment of V
  OS
  is necessary, a 10 kΩ trim 
  potentiometer can be used.


It appears that the OP27 can function with the trim pins unconnected, because they are not really floating.