ifc: fix missing masters/downsample_rate

src/ifc.py

@@ -431,8 +431,12 @@ class TemplateMatchingIFC(IFC):
             b = orig_b.copy()
 
             nslc = b.nslc_id
-            a = self.masters[nslc]
-            downsample(b, 1./self.downsample_rate)
+            a = self.masters.get(nslc, False)
+            if not a:
+                continue
+
+            if self.downsample_rate is not None:
+                downsample(b, 1./self.downsample_rate)
 
             b.highpass(4, self.fmin, demean=False)
             b.lowpass(4, self.fmax, demean=False)