Better exception handling, fixes

app/boot.py

@@ -40,4 +40,4 @@ def boot():
             scheduler.update_nodes_info(background=True)
 
     except ProgrammingError:
-        logger.warn("Could not touch the database. If running a migration, this is expected.")
+        logger.warning("Could not touch the database. If running a migration, this is expected.")

app/models.py

@@ -189,8 +189,8 @@ class Task(models.Model):
 
         try:
             if self.processing_node:
-                # Need to process some images (UUID not yet set)?
-                if not self.uuid:
+                # Need to process some images (UUID not yet set and task not marked for deletion)?
+                if not self.uuid and self.pending_action != pending_actions.REMOVE:
                     logger.info("Processing... {}".format(self))
 
                     images = [image.path() for image in self.imageupload_set.all()]

nodeodm/models.py

@@ -1,5 +1,6 @@
 from __future__ import unicode_literals
 
+import requests
 from django.db import models
 from django.contrib.postgres import fields
 from django.utils import timezone
@@ -84,7 +85,11 @@ class ProcessingNode(models.Model):
         if len(images) < 2: raise ProcessingException("Need at least 2 images")
 
         api_client = self.api_client()
-        result = api_client.new_task(images, name, options)
+        try:
+            result = api_client.new_task(images, name, options)
+        except requests.exceptions.ConnectionError as e:
+            raise ProcessingException(e)
+
         if result['uuid']:
             return result['uuid']
         elif result['error']: