Merge pull request #11598 from narimiran/fix-sharedtables

[bugfix] fix #11588, don't check if SharedTable is initialized

tests/stdlib/tsharedtable.nim

@@ -0,0 +1,14 @@
+discard """
+output: '''
+'''
+"""
+
+import sharedtables
+
+var table: SharedTable[int, int]
+
+init(table)
+table[1] = 10
+assert table.mget(1) == 10
+assert table.mgetOrPut(3, 7) == 7
+assert table.mgetOrPut(3, 99) == 7