fix import error

.github/workflows/python-app.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pyqt5 pytest-qt nixio matplotlib
+        pip install flake8 pyqt5 pytest-qt nixio matplotlib ipython
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |

nixview/ui/plotscreen.py

@@ -10,7 +10,7 @@ import numpy as np
 try:
     import matplotlib.pyplot as plt
 except ImportError as e:
-    print("cannot omport matplotlib", e)
+    print("cannot import matplotlib, headless mode?", e)
 from matplotlib.widgets import Slider
 from IPython import embed