[experiments] Reject scheduling of experiments with unset queue/environment

beat/web/experiments/models.py

@@ -985,6 +985,21 @@ class Block(models.Model):
 
         if self.status != Block.NOT_CACHED: return
 
+        # checks queue and environment
+        if self.queue is None:
+            raise RuntimeError("Block `%s' does not have a queue assigned " \
+                "- this normally indicates the originally selected " \
+                "queue was deleted since the experiment was first " \
+                "configured. Re-configure this experiment and select a new " \
+                "default or block-specific queue" % self.name)
+
+        if self.environment is None:
+            raise RuntimeError("Block `%s' does not have an environment " \
+                "assigned - this normally indicates the originally selected " \
+                "environment was deleted since the experiment was first " \
+                "configured. Re-configure this experiment and select a new " \
+                "default or block-specific environment" % self.name)
+
         from ..backend.models import Job
 
         # search for other jobs with similar outputs and has no children yet