Merge pull request #118 from keflavich/issue117

bugfix: undeclared variable

pvextractor/gui.py

@@ -262,7 +262,7 @@ def __init__(self, filename_or_cube, backend=None, clim=None, cmap=None):
             warnings.warn("spectral_cube package is not available - using astropy.io.fits directly")
             from astropy.io import fits
             self.array = fits.getdata(filename_or_cube)
-            self.shape = array.shape
+            self.shape = self.array.shape
             self.ok_mask = np.isfinite(self.array)
             if self.array.ndim != 3:
                 raise ValueError("dataset does not have 3 dimensions (install the spectral_cube package to avoid this error)")