no complaints about memory if the database is empty

source/net/yacy/kelondro/table/Table.java

@@ -134,8 +134,8 @@ public class Table implements Index, Iterable<Row.Entry> {
             	this.table = null;
             }
             Log.logInfo("TABLE", "initialization of " + tablefile.getName() + ". table copy: " + ((this.table == null) ? "no" : "yes") + ", available RAM: " + (MemoryControl.available() / 1024L / 1024L) + "MB, needed: " + (neededRAM4table / 1024L / 1024L) + "MB, allocating space for " + records + " entries");
-            final long neededRAM4index = 200L * 1024L * 1024L + records * (rowdef.primaryKeyLength + 4L) * 3L / 2L;
-            if (!MemoryControl.request(neededRAM4index, true)) {
+            final long neededRAM4index = 100L * 1024L * 1024L + records * (rowdef.primaryKeyLength + 4L) * 3L / 2L;
+            if (records > 0 && !MemoryControl.request(neededRAM4index, true)) {
                 // despite calculations seemed to show that there is enough memory for the table AND the index
                 // there is now not enough memory left for the index. So delete the table again to free the memory
                 // for the index