Null pointer exception when you remove and old date field type and old data 
still has field
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                 Key: SOLR-1903
                 URL: https://issues.apache.org/jira/browse/SOLR-1903
             Project: Solr
          Issue Type: Bug
          Components: search
    Affects Versions: 1.4
         Environment: linux, windows server and windows 7
            Reporter: Stephen Schwenker


We removed an old date field from our date search because it's not needed 
anymore.  After which we started seeing these errors with old data in the index 
that contained the field.  there are too many records to re-index right now so 
I created this patch.  Also, here is the exception that was thrown.

null java.lang.NullPointerException at 
org.apache.solr.request.XMLWriter.writePrim(XMLWriter.java:761) at 
org.apache.solr.request.XMLWriter.writeStr(XMLWriter.java:619) at 
org.apache.solr.schema.TextField.write(TextField.java:45) at 
org.apache.solr.schema.SchemaField.write(SchemaField.java:108) at 
org.apache.solr.request.XMLWriter.writeDoc(XMLWriter.java:311) at 
org.apache.solr.request.XMLWriter$3.writeDocs(XMLWriter.java:483) at 
org.apache.solr.request.XMLWriter.writeDocuments(XMLWriter.java:420) at 
org.apache.solr.request.XMLWriter.writeDocList(XMLWriter.java:457) at 
org.apache.solr.request.XMLWriter.writeVal(XMLWriter.java:520) at 
org.apache.solr.request.XMLWriter.writeResponse(XMLWriter.java:130) at 
org.apache.solr.request.XMLResponseWriter.write(XMLResponseWriter.java:34) at 
org.apache.solr.servlet.SolrDispatchFilter.writeResponse(SolrDispatchFilter.java:325)
 at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:254)
 at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) 
at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at 
java.lang.Thread.run(Unknown Source) 

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