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Grammar detail: ことはない

ことはない - there is no need to, never happens
154 words
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plain form clause
+
ことはない
means
there is no need to ~, ~ never happens
The plain form clause can be a verb (typically in the present tense):
じぶん
自分
める
ことない
You don't have to kick yourself.
てしまった
からといって
わる
おも
ことない
There's no need to feel bad just because you fell asleep.
Or an い adjective:
れた
ピクニック
ほど
たの
しい
ことない
Nothing is so pleasant as going on a picnic on a fine day.
Or a な adjective with な:
これ
いじょう
以上
ふゆかい
不愉快
ことない
There is no more disagreeable thing than this.
This construction is similar to ことがない, and in many cases they are interchangeable. ことがない is usually used with a past tense verb (to mean 'has not happened' rather than 'never happens'), and although it is not wrong to use ことはない with a past tense verb, it is less common.
If the clause containing こと~ない is itself the subject of a larger sentence which would be marked with the subject marker が, it would be preferable to use は to avoid repetition of が:
きょうと
京都
った
ことはない
なら
奈良
なんど
何度
った

I've never been to Kyoto, but I've been to Nara several times.
The ことはない form is often used as part of two common set phrases, そんなことはない (that's not the case) and 大したことはない (that's not important):
かのじょ
彼女
かぎ
って
そんなことない
She, of all people, wouldn't do such a thing.
ひとり
一人
くらい
えて
って
たいしたことない
One person more or less doesn't make much difference.
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Kanji used in this grammar

ダイ   タイ   おおきい big   おおいに very much   おお-    
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ジ   シ   みずか self   
ブン   ブ   フン   わける to divide, to distinguish   わかる to understand   わかれる to be divided   わかつ to share, distribute   
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セキ   せめる to torture; to blame, accuse   
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シン   ねかす to lay down   ね to sleep, to lie down   
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アク   オ   わる bad   
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シ   おも to think   
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セイ   はれる to clear up   はらす to dispel, to clear away   
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ニチ   ジツ   sun; day   ひ    -か    
コウ   ギョウ   アン   ゆ    い to go   おこな to take place   
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ガク   ラク    music   たのしい happy, pleasant   たのしむ to be happy   
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イ    (prefix) or   
ジョウ   ショウ   うえ above   うわ- above   あげる to raise   あがる to rise   かみ first half, upper part   のぼ to climb   のぼせる to bring up, to raise   のぼ to bring up   
フ   ブ    not   
ユ    pleasure   
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カイ   こころよ comfortable, pleasant, refreshing   
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キョウ   ケイ    capital   
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ト   ツ   みやこ capital city, metropolis   
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ナ    Nara   
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リョウ   よ good   
カ   なに    なん what?   
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ド   ト   タク   degree   たび occasion, time   
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ヒ   かれ he   
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ジョ   ニョ   ニョウ   woman; female   おんな woman   め woman   
ゲン   かぎ to limit, restrict   
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イチ   イツ   ひと    ひと- one   
ジン   ニン   ひと person   
ゾウ   ま to increase/grow   ふえる to increase/multiply   ふやす to increase/augment   
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ゲン   へ become less   へらす reduce   
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