Fixed [Issue 210] semicolon being ignored.

com.google.eclipse.protobuf.ui/src/com/google/eclipse/protobuf/ui/commands/semicolon/SmartSemicolonHandler.java

diff --git a/com.google.eclipse.protobuf.ui/src/com/google/eclipse/protobuf/ui/commands/semicolon/SmartSemicolonHandler.java b/com.google.eclipse.protobuf.ui/src/com/google/eclipse/protobuf/ui/commands/semicolon/SmartSemicolonHandler.java
index 63fdb18..7d2155d 100644
--- a/com.google.eclipse.protobuf.ui/src/com/google/eclipse/protobuf/ui/commands/semicolon/SmartSemicolonHandler.java
+++ b/com.google.eclipse.protobuf.ui/src/com/google/eclipse/protobuf/ui/commands/semicolon/SmartSemicolonHandler.java
@@ -82,7 +82,7 @@
       document.modify(new IUnitOfWork.Void<XtextResource>() {
         @Override public void process(XtextResource resource) {
           Protobuf root = resources.rootOf(resource);
-          if (!protobufs.isProto2(root)) {
+          if (!protobufs.isProto2(root) || !resource.getErrors().isEmpty()) {
             return;
           }
           int offset = styledTextAccess.caretOffset();