[OMCSessionZMQ.sendExpression] check for basic errors ('Error occurred building AST') (#363)

Author: syntron

OMPython/OMCSession.py

@@ -702,6 +702,9 @@ def sendExpression(self, command: str, parsed: bool = True) -> Any:
 
         result = self.omc_zmq.recv_string()
 
+        if result.startswith('Error occurred building AST'):
+            raise OMCSessionException(f"OMC error: {result}")
+
         if command == "getErrorString()":
             # no error handling if 'getErrorString()' is called
             if parsed: