ifc: fix optional downsample_rate

src/ifc.py

@@ -325,7 +325,7 @@ class TemplateMatchingIFC(IFC):
         help='Event parameters of the template')
 
     template_markers_path = common.Path.T(
-        optional=True,
+        optional=False,
         help='File with markers defining the template')
 
     sum_square = Bool.T(
@@ -395,7 +395,8 @@ class TemplateMatchingIFC(IFC):
         masters = {}
         for xtr in master_traces:
             tr = xtr.copy()
-            downsample(tr, 1./self.downsample_rate)
+            if self.downsample_rate is not None:
+                downsample(tr, 1./self.downsample_rate)
 
             tr.highpass(4, self.fmin, demean=False)
             tr.lowpass(4, self.fmax, demean=False)