Geometry: Fix ST file import function.

src/Model/Geometry/Reach.py

@@ -413,8 +413,7 @@ class Reach:
                         elif len(line) == 5:
                             line.append("")
                             list_header.append(line)
-                        else:
-                            line_is_header = False
+                        line_is_header = False
                     else:
                         # Read until "999.9990     999.9990" as found
                         if len(line) == 3: