**Related issue**: N/A
**Type of change**: bug fix
**Impact**: other
**Release Notes**
The string of path for "-ip-vivado-tcls" could be empty ("")
For example, run "make SUB_PROJECT=arty bitstream" will get errors due the argument parsing in [prologue.tcl](d4b3878e4f/xilinx/common/tcl/prologue.tcl)
Swaping the two arguments can resolve bug.