Fix issue where lint would crash trying to evaluate a function without the expected node ancestry (#3)

Author: msluther

lib/util/findNodes.js

@@ -26,6 +26,7 @@ function findFormattedMessageAttrNode(node, attrName) {
   if (
     node.type === 'JSXIdentifier'
     && node.name === 'FormattedMessage'
+    && node.parent
     && node.parent.type === 'JSXOpeningElement'
   ) {
     return node.parent.attributes.find(a => a.name && a.name.name === attrName);
@@ -42,6 +43,10 @@ function findFormattedMessageAttrNode(node, attrName) {
 function findAttrNodeInDefineMessages(node, attrName) {
   if (node.type === 'Property'
     && node.key.name === attrName
+    && node.parent
+    && node.parent.parent
+    && node.parent.parent.parent
+    && node.parent.parent.parent.parent
     && node.parent.parent.parent.parent.type === 'CallExpression'
     && node.parent.parent.parent.parent.callee.name === 'defineMessages'
   ) {