fix failing tests

Author: Joshua Monson

src/qonnx/transformation/general.py

@@ -248,7 +248,8 @@ def apply(self, model):
                     # check if node inputs are connected to graph inputs or initializers
                     # if so, we can keep the node in the graph
                     for name in n.input:
-                        if model.get_initializer(name) or util.get_by_name(model.graph.input, name, "name"):
+                        if util.get_by_name(model.graph.initializer, name) or \
+                           util.get_by_name(model.graph.input, name):
                             # this node is connected to graph inputs or initializers
                             # so we can keep it in the graph
                             graph_dependencies[node_idx] = set()