fixup! toolbox/supsisim/supsisim/scene.py: raise exception when C build fails

Author: michallenc

toolbox/supsisim/supsisim/scene.py

@@ -538,10 +538,10 @@ def _parseAddCDefs(addCDefs: str) -> str:
             if flag:
                 cmd = pyrun + ' tmp.py'
                 try:
-                    p = subprocess.Popen(cmd, shell=True)
-                except:
-                    pass
-                p.wait()
+                    subprocess.run(cmd, shell=True, check=True)
+                except subprocess.CalledProcessError:
+                    del(dgmBlocks)
+                    return False
 
             # Reset block diagram to previous state
             del(dgmBlocks)