diff --git a/.github/workflows/tests-core.yaml b/.github/workflows/tests-core.yaml
index 57028bd..c839249 100644
--- a/.github/workflows/tests-core.yaml
+++ b/.github/workflows/tests-core.yaml
@@ -20,8 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.10", "3.11", "3.12"]
-        os: [ubuntu-22.04]
-        #TODO: re-enable ubuntu-latest, this is disabled as oscrypto cannot be pinned to github commit and pushed to pypi
+        os: [ubuntu-22.04, ubuntu-latest]
     defaults:
       run:
         working-directory: ./
diff --git a/.github/workflows/tests-download.yaml b/.github/workflows/tests-download.yaml
index a68231f..a8337cf 100644
--- a/.github/workflows/tests-download.yaml
+++ b/.github/workflows/tests-download.yaml
@@ -1,15 +1,23 @@
 name: Download Tests
 
 on:
+  # Schedule this workflow to run every Monday at 14:35 UTC
   schedule:
     - cron: '35 14 * * 1'
-  pull_request:
-    branches: [ main ]
+  
+  # For PRs, run the tests-core workflow first
+  workflow_run:
+    workflows: ["Core Tests"]
+    types:
+      - completed
+    branches: [main]
     paths:
       - src/**
 
 jobs:
   tests:
+    # Only run if the triggering workflow (tests-core) succeeded
+    if: ${{ github.event_name == 'schedule' || github.event.workflow_run.conclusion == 'success' }}
     runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
@@ -21,6 +29,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.workflow_run.head_branch || github.ref }}
 
       - name: Install poetry
         run: pipx install poetry
diff --git a/src/auto_archiver/core/module.py b/src/auto_archiver/core/module.py
index 3fdc3ae..1494fd6 100644
--- a/src/auto_archiver/core/module.py
+++ b/src/auto_archiver/core/module.py
@@ -214,11 +214,8 @@ class LazyBaseModule:
 
         # check external dependencies are installed
         def check_deps(deps, check):
-            for dep in deps:
-                if not len(dep):
-                    # clear out any empty strings that a user may have erroneously added
-                    continue
-                if not check(dep):
+            for dep in filter(lambda d: len(d.strip()), deps):
+                if not check(dep.strip()):
                     logger.error(
                         f"Module '{self.name}' requires external dependency '{dep}' which is not available/setup. \
                                  Have you installed the required dependencies for the '{self.name}' module? See the documentation for more information."