Fixed pop assessment

Author: ODiogoSilva

structure_threader/plotter/structplot.py

@@ -374,7 +374,7 @@ def __init__(self, ouput_file_list, fmt, popfile=None, indfile=None):
         # Parse each output file and add it to the kvals attribute
         for fpath in ouput_file_list:
 
-            if self.indv is None and self.pops is None:
+            if self.indv is None and self.pops == []:
                 # Create PlotK object
                 kobj = PlotK(fpath, self.fmt, get_indv=True)
                 self.indv = kobj.indv