fixed --out-format option

Author: Aklakan

rdf-processing-toolkit-cli/src/main/java/org/aksw/sparql_integrate/cli/main/SparqlIntegrateCmdImpls.java

@@ -248,7 +248,7 @@ public static int sparqlIntegrate(CmdSparqlIntegrateMain cmd) throws Exception {
                 ? outFilename
                 : outFormat;
 
-        if (formatSource != null) {
+        if (outFormat == null && formatSource != null) {
             // Try to derive the outFormat from the filename - if given.
             FileName fn = fileNameParser.parse(formatSource);
             outFormat = fn.getContentPart();