update circleci, travis, better error message

.circleci/config.yml

@@ -21,6 +21,11 @@ jobs:
                     wget https://github.com/jgm/pandoc/releases/download/1.19.2.1/pandoc-1.19.2.1-1-amd64.deb
                     sudo dpkg -i pandoc-1.19.2.1-1-amd64.deb
           
+      - run:
+          name: Install freetype
+          command: |
+                    sudo apt-get install -y freetype
+          
       - run:
           name: Install tex
           command: |

.travis.yml

@@ -9,7 +9,8 @@ addons:
       - ffmpeg
       - gfortran
       - libhdf5-serial-dev
-      - liblapack-dev      
+      - liblapack-dev
+      - freetype
 install:
   # We do this conditionally because it saves us some downloading if the
   # version is the same.

src/code_beatrix/faq/faq_video.py

@@ -23,6 +23,13 @@
 from skimage.transform import rescale
 
 
+class FontError(Exception):
+    """
+    Raised when a font cannot be found.
+    """
+    pass
+
+
 ##########
 # youtube
 ##########
@@ -626,7 +633,10 @@ def video_text(text, font=None, fontsize=32, size=None,
             font = "arial.ttf"
         else:
             font = "fnt/arial.ttf"
-    obj = ImageFont.truetype(font=font, size=fontsize)
+    try:
+        obj = ImageFont.truetype(font=font, size=fontsize)
+    except OSError as e:
+        raise FontError("Unable to find font '{0}'".format(font)) from e
     if size is None:
         size = obj.getsize(text)
     elif isinstance(size, (float, int)):