Fix NPE in TypeOracle build.

http://gwt-code-reviews.appspot.com/910802/show

Review by: conroy@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8852 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/dev/core/src/com/google/gwt/dev/javac/MethodArgNamesLookup.java b/dev/core/src/com/google/gwt/dev/javac/MethodArgNamesLookup.java
index aba7337..b4bb5a3 100644
--- a/dev/core/src/com/google/gwt/dev/javac/MethodArgNamesLookup.java
+++ b/dev/core/src/com/google/gwt/dev/javac/MethodArgNamesLookup.java
@@ -38,15 +38,15 @@
   }
 
   /**
-   * Prevent further modification to this object.  Calls to
-   * {@link #store(String, AbstractMethodDeclaration)} or 
+   * Prevent further modification to this object. Calls to
+   * {@link #store(String, AbstractMethodDeclaration)} or
    * {@link #mergeFrom(MethodArgNamesLookup)} on this object will fail after
    * this method is called.
    */
   public void freeze() {
     methodArgs = Maps.normalizeUnmodifiable(methodArgs);
   }
-  
+
   /**
    * Lookup the argument names for a given method.
    * 
@@ -80,8 +80,11 @@
    * @param enclosingType fully qualified binary name of the enclosing type
    * @param method JDT method
    */
-  public void store(String enclosingType,
-      AbstractMethodDeclaration method) {
+  public void store(String enclosingType, AbstractMethodDeclaration method) {
+    if (method.binding == null) {
+      // Compile problem with this method, skip
+      return;
+    }
     int n = method.arguments.length;
     String[] argNames = new String[n];
     for (int i = 0; i < n; ++i) {