Merge pull request #2793 from Pinata-Consulting/synth-error-on-no-adder-map-file

synth: replace silent error with some sort of error

Author: maliberty

flow/scripts/synth.tcl

@@ -47,7 +47,7 @@ renames -wire
 opt -purge
 
 # Technology mapping of adders
-if {[env_var_exists_and_non_empty ADDER_MAP_FILE] && [file isfile $::env(ADDER_MAP_FILE)]} {
+if {[env_var_exists_and_non_empty ADDER_MAP_FILE]} {
   # extract the full adders
   extract_fa
   # map full adders