allow to manage empty dataset for flatten_lin_matrix

Author: AntSimi

src/py_eddy_tracker/dataset/grid.py

@@ -307,18 +307,6 @@ def __init__(
             self.load_general_features()
             self.load()
 
-    def get_slice(self, **kwargs):
-        """
-        Get slice for each axes specified
-
-        :param dict kwargs:
-        :return: A dict of slice
-        :rtype: dict[slice]
-        """
-        for k, v in kwargs.items():
-            with Dataset(self.filename) as h:
-                print(k, v)
-
     @property
     def is_centered(self):
         """Give True if pixel is described with its center's position or

src/py_eddy_tracker/generic.py

@@ -278,7 +278,14 @@ def flatten_line_matrix(l_matrix):
     """
     nb_line, sampling = l_matrix.shape
     final_size = (nb_line - 1) + nb_line * sampling
+    empty_dataset = False
+    if final_size < 1:
+        empty_dataset = True
+        final_size = 1
     out = empty(final_size, dtype=l_matrix.dtype)
+    if empty_dataset:
+        out[:] = nan
+        return out
     inc = 0
     for i in range(nb_line):
         for j in range(sampling):