return True in Extension.async_cmd_check if async_cmd_info is set to False, which indicates that no asynchronous command was started

Author: boegel

easybuild/framework/extension.py

@@ -200,13 +200,17 @@ def async_cmd_check(self):
         """
         if self.async_cmd_info is None:
             raise EasyBuildError("No installation command running asynchronously for %s", self.name)
+        elif self.async_cmd_info is False:
+            self.log.info("No asynchronous command was started for extension %s", self.name)
+            return True
         else:
             self.log.debug("Checking on installation of extension %s...", self.name)
             # use small read size, to avoid waiting for a long time until sufficient output is produced
             res = check_async_cmd(*self.async_cmd_info, output_read_size=self.async_cmd_read_size)
             self.async_cmd_output += res['output']
             if res['done']:
                 self.log.info("Installation of extension %s completed!", self.name)
+                self.async_cmd_info = None
             else:
                 self.async_cmd_check_cnt += 1
                 self.log.debug("Installation of extension %s still running (checked %d times)",