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<https://github.com/The-OpenROAD-Project/OpenLane/issues/576|#576 Error: or_opendp.tcl, 29 can't read "::env(PL_DIAMOND_SEARCH_HEIGHT)": no such variable>
New issue created by <https://github.com/madgo1991|madgo1991>
*Description*

Getting following error :  
Error: or_opendp.tcl, 29 can't read "::env(PL_DIAMOND_SEARCH_HEIGHT)": no such variable

In README.MD file it says this switch has been removed. But it seems it is still looking for this in the script.  
Kindly help.

*Environment*

• Operating System Information: `Ubuntu`
• Docker Version: Docker version 20.10.7, build 20.10.7-0ubuntu1~18.04.1
• OpenLane version : 0.15
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>