ignore errors due to wrong encoding in agr files (#22)

Co-authored-by: Dominik Demuth <dominik.demuth@physik.tu-darmstadt.de>
Reviewed-on: #22

src/gui_qt/io/gracereader.py

@@ -1,3 +1,5 @@
+import numpy as np
+
 from nmreval.lib.lines import LineStyle
 from nmreval.lib.symbols import SymbolStyle
 from nmreval.data.points import Points
@@ -90,6 +92,7 @@ class QGraceReader(QtWidgets.QDialog, Ui_Dialog):
             label = self._reader.get_property(*key, 'legend').replace('"', '')
             # label = self._reader.graphs[key[0]].sets[key[1]]['legend'].replace('"', '')
             sd = s.data
+            sd = np.atleast_2d(sd)
             if s.type == 'xydy':
                 data.append(Points(x=sd[:, 0], y=sd[:, 1], y_err=sd[:, 2], name=label))
             else: