taxref: catch errors on JSON decoding

edmond/plugins/taxref.py

@@ -73,7 +73,12 @@ class TaxrefPlugin(Plugin):
         if response.status_code != 200:
             self.signal_failure(target)
             return
-        data = response.json()
+        try:
+            data = response.json()
+        except ValueError:
+            self.signal_failure(target)
+            return
+
         items = data.get("_embedded", {}).get("taxa", [])
 
         if not items:
@@ -195,7 +200,11 @@ class TaxrefPlugin(Plugin):
         if response.status_code != 200:
             self.signal_failure(target)
             return
-        data = response.json()
+        try:
+            data = response.json()
+        except ValueError:
+            self.signal_failure(target)
+            return
         items = data.get("_embedded", {}).get("taxa", [])
 
         if not items: